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Search results for problems posted by Jer :
Gold-in pyramid (in Shapes)
Posted on 2020-10-06 by Jer (Solution Posted, 6 Comments)
Two slopes out of three (in Calculus) Rating: 5.00
Posted on 2020-09-18 by Jer (No Solution Yet, 1 Comments)
Equilateral hexagon (in Geometry)
Posted on 2020-09-08 by Jer (No Solution Yet, 5 Comments)
Erase a prime (in Numbers) Rating: 3.00
Posted on 2020-08-03 by Jer (No Solution Yet, 4 Comments)
Yoshigahara's Masterpiece (in Logic)
Posted on 2020-07-31 by Jer (No Solution Yet, 3 Comments)
Average other (in Numbers) Rating: 4.00
Posted on 2020-07-01 by Jer (No Solution Yet, 5 Comments)
The odd one out. (in Logic) Rating: 4.50
Posted on 2020-06-22 by Jer (Solution Posted, 5 Comments)
Square and triangle in a circle (in Geometry) Rating: 2.00
Posted on 2020-04-13 by Jer (No Solution Yet, 5 Comments)
3 equilateral triangles in a rectangle (in Geometry)
Posted on 2020-02-28 by Jer (Solution Posted, 2 Comments)
3 circles in an isosceles trapezoid (in Geometry)
Posted on 2020-01-10 by Jer (No Solution Yet, 3 Comments)
Equal angles within a right triangle (in Geometry)
Posted on 2020-01-08 by Jer (No Solution Yet, 2 Comments)
Roll a unit (in Probability) Rating: 1.00
Posted on 2019-11-06 by Jer (Solution Posted, 2 Comments)
5 circles in a square part 2 (in Geometry)
Posted on 2019-09-08 by Jer (No Solution Yet, 1 Comments)
5 circles in a square part 1 (in Geometry)
Posted on 2019-08-28 by Jer (No Solution Yet, 5 Comments)
(7x7-1) = 2(5x5-1) (in Shapes) Rating: 5.00
Posted on 2019-06-25 by Jer (No Solution Yet, 3 Comments)
What's the calculator doing? (in General)
Posted on 2019-03-06 by Jer (No Solution Yet, 4 Comments)
Grid nim: 2xN (in Games) Rating: 4.50
Posted on 2019-01-16 by Jer (No Solution Yet, 4 Comments)
Two triangles in a square (in Geometry)
Posted on 2019-01-12 by Jer (No Solution Yet, 2 Comments)
Cover half a square (in Geometry)
Posted on 2018-12-18 by Jer (No Solution Yet, 3 Comments)
Colored triangle (in Sequences) Rating: 4.00
Posted on 2018-12-14 by Jer (No Solution Yet, 10 Comments)
5 circles in a hexagon. (in Geometry)
Posted on 2018-11-25 by Jer (No Solution Yet, 9 Comments)
Monty Hall variant (in Probability)
Posted on 2018-09-30 by Jer (No Solution Yet, 6 Comments)
Weight of nothing in an elevator (in Science)
Posted on 2018-09-06 by Jer (No Solution Yet, 6 Comments)
A pet ant (in Shapes)
Posted on 2018-08-31 by Jer (No Solution Yet, 3 Comments)
Power tower (in Numbers)
Posted on 2018-08-26 by Jer (No Solution Yet, 1 Comments)
Ant highway with energy loss (in Calculus)
Posted on 2018-08-24 by Jer (No Solution Yet, 9 Comments)
Tax deduction (in Numbers) Rating: 3.00
Posted on 2018-08-22 by Jer (No Solution Yet, 6 Comments)
Winner moves (in Probability)
Posted on 2018-08-20 by Jer (No Solution Yet, 2 Comments)
Ant highway (in Shapes)
Posted on 2018-08-17 by Jer (No Solution Yet, 3 Comments)
Roll away (in Calculus)
Posted on 2018-08-15 by Jer (No Solution Yet, 4 Comments)
Tippy table (in Shapes)
Posted on 2018-08-14 by Jer (No Solution Yet, 3 Comments)
Play until you win (in Probability)
Posted on 2018-06-15 by Jer (No Solution Yet, 1 Comments)
Posted on 2018-06-09 by Jer (No Solution Yet, 0 Comments)
The Truman Show (in Geometry)
Posted on 2018-03-02 by Jer (No Solution Yet, 4 Comments)
Double Secant (in Geometry)
Posted on 2018-02-15 by Jer (No Solution Yet, 3 Comments)
Incenter and a half (in Geometry)
Posted on 2018-02-03 by Jer (No Solution Yet, 2 Comments)
Quadrilateral fill in the blank (in Shapes)
Posted on 2018-01-25 by Jer (No Solution Yet, 2 Comments)
The Sleeping Beauty problem (in Probability)
Posted on 2018-01-22 by Jer (No Solution Yet, 4 Comments)
Fair slices (in Geometry)
Posted on 2018-01-16 by Jer (No Solution Yet, 8 Comments)
15 letter 'words' (in Just Math)
Posted on 2018-01-11 by Jer (No Solution Yet, 1 Comments)
Magic circle revisited (in Numbers) Rating: 3.00
Posted on 2017-12-22 by Jer (No Solution Yet, 5 Comments)
Does it continue? An original. (in Numbers)
Posted on 2017-10-20 by Jer (No Solution Yet, 7 Comments)
If two then three (in Just Math)
Posted on 2017-10-14 by Jer (No Solution Yet, 1 Comments)
Equal Power Sum Sets (in Numbers)
Posted on 2017-10-11 by Jer (No Solution Yet, 1 Comments)
Does it continue? 10: Alternate differences (in Numbers)
Posted on 2017-10-07 by Jer (No Solution Yet, 2 Comments)
Does it continue? 9: Diophantine friends (in Numbers)
Posted on 2017-10-03 by Jer (No Solution Yet, 1 Comments)
Does it continue? 8: Prime together (in Numbers)
Posted on 2017-09-30 by Jer (No Solution Yet, 1 Comments)
Does it continue? 7: Partial sums again (in Numbers)
Posted on 2017-09-28 by Jer (No Solution Yet, 1 Comments)
Does it continue? 6: Partial sums (in Numbers)
Posted on 2017-09-25 by Jer (No Solution Yet, 7 Comments)
Does it continue? 5: powers of 2 (in Numbers) Rating: 5.00
Posted on 2017-09-24 by Jer (No Solution Yet, 6 Comments)
Does it continue? 4: Euclid's next prime (in Numbers)
Posted on 2017-09-21 by Jer (No Solution Yet, 3 Comments)
Does it continue? 3: Growing table of primes (in Numbers)
Posted on 2017-09-19 by Jer (No Solution Yet, 3 Comments)
Does it continue? 2: Prime or not? (in Numbers) Rating: 5.00
Posted on 2017-09-16 by Jer (No Solution Yet, 6 Comments)
Does it continue? 1: Chord regions (in Sequences)
Posted on 2017-09-13 by Jer (No Solution Yet, 9 Comments)
MMMMMM Donut (in Just Math)
Posted on 2017-09-11 by Jer (No Solution Yet, 4 Comments)
Who began with 50 cents? (in Just Math)
Posted on 2017-09-06 by Jer (No Solution Yet, 3 Comments)
Simple trains problem (in Just Math) Rating: 3.00
Posted on 2017-08-29 by Jer (No Solution Yet, 2 Comments)
Triangle in a triangle (in Shapes)
Posted on 2017-08-28 by Jer (No Solution Yet, 4 Comments)
Avoiding lattice midpoints (in General) Rating: 5.00
Posted on 2017-08-27 by Jer (No Solution Yet, 3 Comments)
Strobogrammatic to pandigital (in Numbers) Rating: 5.00
Posted on 2017-08-26 by Jer (No Solution Yet, 4 Comments)
smallest large = largest small (in Logic) Rating: 3.00
Posted on 2017-08-22 by Jer (No Solution Yet, 3 Comments)
Posted on 2017-08-20 by Jer (No Solution Yet, 3 Comments)
Planks across a ditch (in Shapes) Rating: 4.00
Posted on 2017-08-17 by Jer (No Solution Yet, 4 Comments)
A unique Heronian triangle (in Geometry)
Posted on 2017-08-05 by Jer (No Solution Yet, 6 Comments)
Dec = xeh (in Numbers)
Posted on 2017-08-02 by Jer (No Solution Yet, 5 Comments)
Heronian with consecutives (in Geometry) Rating: 3.00
Posted on 2017-07-29 by Jer (No Solution Yet, 1 Comments)
From The Book of Squares (in Numbers) Rating: 3.00
Posted on 2017-07-26 by Jer (No Solution Yet, 5 Comments)
An ambiguous inheritance (in Just Math)
Posted on 2017-07-25 by Jer (No Solution Yet, 4 Comments)
From Mahavira (in Just Math)
Posted on 2017-07-18 by Jer (No Solution Yet, 11 Comments)
Pythagorean H/L ratios (in Just Math)
Posted on 2017-07-08 by Jer (No Solution Yet, 2 Comments)
Larger area / larger perimeter (in Numbers)
Posted on 2017-07-03 by Jer (No Solution Yet, 3 Comments)
Square Egyptians (in Numbers)
Posted on 2017-06-28 by Jer (No Solution Yet, 1 Comments)
Giveaway ratios (in Numbers)
Posted on 2017-06-26 by Jer (No Solution Yet, 3 Comments)
Odd Egyptians (in Numbers)
Posted on 2017-06-21 by Jer (No Solution Yet, 2 Comments)
Pythagoras' corner (in Geometry)
Posted on 2017-06-16 by Jer (No Solution Yet, 3 Comments)
Delian delight (in Geometry)
Posted on 2017-06-04 by Jer (No Solution Yet, 3 Comments)
Many equal shapes (in Geometry)
Posted on 2017-04-30 by Jer (No Solution Yet, 0 Comments)
Is it a conic? (in Geometry) Rating: 4.00
Posted on 2017-04-19 by Jer (No Solution Yet, 7 Comments)
A better approximate Pythagorean Theorem (in Calculus)
Posted on 2017-02-08 by Jer (No Solution Yet, 1 Comments)
The Almost Pythagorean Theorem (in Calculus) Rating: 3.00
Posted on 2017-02-03 by Jer (No Solution Yet, 1 Comments)
Posted on 2017-01-12 by Jer (No Solution Yet, 4 Comments)
Hardest easy geometry problem (in Geometry) Rating: 4.00
Posted on 2016-11-04 by Jer (No Solution Yet, 2 Comments)
Go back or double (in Sequences)
Posted on 2016-07-25 by Jer (No Solution Yet, 5 Comments)
Posted on 2016-07-10 by Jer (No Solution Yet, 12 Comments)
Amicable pair generator (in Numbers)
Posted on 2016-07-08 by Jer (No Solution Yet, 1 Comments)
Find Counterexamples (in Numbers)
Posted on 2016-07-06 by Jer (No Solution Yet, 1 Comments)
Sequence starting with 30 (in Numbers)
Posted on 2016-07-05 by Jer (No Solution Yet, 3 Comments)
Fibonacci yields Pythagoras (in Sequences)
Posted on 2016-07-05 by Jer (No Solution Yet, 1 Comments)
S.O.D = cube root (in Numbers)
Posted on 2016-07-04 by Jer (No Solution Yet, 3 Comments)
Pentagonal triple triangles (in Geometry)
Posted on 2016-07-01 by Jer (No Solution Yet, 4 Comments)
4 numbers make 5 squares (in Numbers)
Posted on 2016-06-30 by Jer (No Solution Yet, 10 Comments)
Simple number trick (in Numbers) Rating: 2.50
Posted on 2016-06-29 by Jer (Solution Posted, 5 Comments)
Fractions lead to Pythagoreans (in Numbers)
Posted on 2016-06-28 by Jer (No Solution Yet, 4 Comments)
Pandigital pattern (in Numbers)
Posted on 2016-06-28 by Jer (No Solution Yet, 2 Comments)
Posted on 2016-06-27 by Jer (No Solution Yet, 4 Comments)
Progressive probability (in Probability)
Posted on 2016-06-15 by Jer (No Solution Yet, 1 Comments)
Colored Candy Choice (in Probability)
Posted on 2016-05-25 by Jer (No Solution Yet, 10 Comments)
Star-shaped polyominos (in Shapes)
Posted on 2016-03-28 by Jer (No Solution Yet, 7 Comments)
Ring of triangles II (in Geometry)
Posted on 2016-03-10 by Jer (No Solution Yet, 2 Comments)
More bouncing (in Geometry)
Posted on 2016-03-09 by Jer (No Solution Yet, 3 Comments)
Ring of triangles I (in Geometry)
Posted on 2016-03-02 by Jer (No Solution Yet, 2 Comments)
Evaluate further probabilities (in Probability)
Posted on 2016-02-03 by Jer (No Solution Yet, 1 Comments)
Lost in the woods (in Just Math) Rating: 5.00
Posted on 2016-01-08 by Jer (Solution Posted, 12 Comments)
Two related sequences (in Sequences)
Posted on 2015-12-30 by Jer (No Solution Yet, 0 Comments)
Protecting the fleet Part E. (in Calculus) Rating: 4.00
Posted on 2015-12-23 by Jer (No Solution Yet, 3 Comments)
Protecting the fleet Parts C. & D. (in Geometry)
Posted on 2015-12-15 by Jer (No Solution Yet, 2 Comments)
Protecting the fleet Parts A. & B. (in Geometry)
Posted on 2015-12-14 by Jer (No Solution Yet, 4 Comments)
Fibonaccish ratio (in Sequences) Rating: 3.00
Posted on 2015-12-07 by Jer (No Solution Yet, 3 Comments)
Root factorial (in Numbers)
Posted on 2015-11-25 by Jer (No Solution Yet, 1 Comments)
Square in a notched square (in Geometry)
Posted on 2015-11-25 by Jer (No Solution Yet, 3 Comments)
An interesting matrix (in Sequences)
Posted on 2015-11-05 by Jer (No Solution Yet, 3 Comments)
Some questions of abundance (in Just Math)
Posted on 2015-10-28 by Jer (No Solution Yet, 3 Comments)
Permutations count redux (in Numbers)
Posted on 2015-10-09 by Jer (No Solution Yet, 1 Comments)
Step right up! (in Games)
Posted on 2015-09-09 by Jer (No Solution Yet, 1 Comments)
Divide et impera part two (in Numbers)
Posted on 2015-08-26 by Jer (No Solution Yet, 2 Comments)
Fibonacci appears again (in Sequences)
Posted on 2015-08-21 by Jer (Solution Posted, 0 Comments)
Simpler probability problem? (in Probability)
Posted on 2015-08-11 by Jer (No Solution Yet, 14 Comments)
Best guess (in Probability)
Posted on 2015-07-30 by Jer (No Solution Yet, 3 Comments)
Bean coloring (in Probability) Rating: 4.50
Posted on 2015-07-13 by Jer (No Solution Yet, 11 Comments)
One 1 to Six 6's (in Probability) Rating: 5.00
Posted on 2015-07-01 by Jer (No Solution Yet, 14 Comments)
Map coloring (in Shapes) Rating: 3.33
Posted on 2015-06-05 by Jer (Solution Posted, 8 Comments)
Rational or not? (in Just Math) Rating: 5.00
Posted on 2015-05-29 by Jer (No Solution Yet, 5 Comments)
A many chords problem (in Geometry)
Posted on 2015-05-27 by Jer (No Solution Yet, 0 Comments)
Sinusoidal System (in Just Math)
Posted on 2015-05-24 by Jer (No Solution Yet, 2 Comments)
Random numbers sum together (in Probability)
Posted on 2015-05-15 by Jer (No Solution Yet, 3 Comments)
2^(10n) (in Numbers) Rating: 2.00
Posted on 2015-04-15 by Jer (Solution Posted, 8 Comments)
Tile flipping (in Just Math) Rating: 4.00
Posted on 2015-04-08 by Jer (No Solution Yet, 12 Comments)
Domain and Range (in Just Math)
Posted on 2015-04-02 by Jer (No Solution Yet, 1 Comments)
Reflection Matrix (in Just Math)
Posted on 2015-04-01 by Jer (No Solution Yet, 3 Comments)
Painting high dimension cubes (in Shapes)
Posted on 2015-03-05 by Jer (No Solution Yet, 4 Comments)
Double a triangle (in Sequences)
Posted on 2015-02-19 by Jer (No Solution Yet, 3 Comments)
Approximating radicals (in Numbers) Rating: 4.00
Posted on 2015-02-17 by Jer (No Solution Yet, 4 Comments)
Shared by squares (in Algorithms) Rating: 4.00
Posted on 2015-02-10 by Jer (No Solution Yet, 3 Comments)
Match 3 Game (in General)
Posted on 2015-01-02 by Jer (No Solution Yet, 2 Comments)
Random^Random (in Probability) Rating: 5.00
Posted on 2014-10-29 by Jer (Solution Posted, 9 Comments)
Counting Crossings (in Geometry) Rating: 4.00
Posted on 2014-10-08 by Jer (No Solution Yet, 7 Comments)
Moving target (in Shapes)
Posted on 2014-09-25 by Jer (No Solution Yet, 2 Comments)
Posted on 2014-09-15 by Jer (No Solution Yet, 1 Comments)
4 cents (in Shapes)
Posted on 2014-09-12 by Jer (No Solution Yet, 11 Comments)
3 cents (in Shapes)
Posted on 2014-08-29 by Jer (No Solution Yet, 3 Comments)
Union of squares (in Shapes) Rating: 3.00
Posted on 2014-07-09 by Jer (No Solution Yet, 10 Comments)
A tall tower (in Geometry)
Posted on 2014-06-18 by Jer (No Solution Yet, 6 Comments)
Arithmetic Grid II (in Just Math)
Posted on 2014-06-12 by Jer (No Solution Yet, 2 Comments)
Make one hundred (in Numbers) Rating: 5.00
Posted on 2014-05-17 by Jer (No Solution Yet, 7 Comments)
Expected of each (in Probability)
Posted on 2014-05-15 by Jer (No Solution Yet, 3 Comments)
Sequence containing itself (in Numbers)
Posted on 2014-05-14 by Jer (No Solution Yet, 1 Comments)
Expected Smaller (in Probability)
Posted on 2014-05-12 by Jer (No Solution Yet, 2 Comments)
More mean median mode (in Just Math)
Posted on 2014-02-21 by Jer (No Solution Yet, 3 Comments)
Mean = median (in Just Math)
Posted on 2014-02-20 by Jer (No Solution Yet, 4 Comments)
Get a good look (in Calculus)
Posted on 2014-02-18 by Jer (No Solution Yet, 5 Comments)
Staircase tilings (in Shapes)
Posted on 2014-02-13 by Jer (No Solution Yet, 1 Comments)
Reciprocal composition is reciprocal. (in Just Math)
Posted on 2014-02-08 by Jer (No Solution Yet, 4 Comments)
Primes square (in Just Math) Rating: 3.00
Posted on 2014-02-07 by Jer (No Solution Yet, 1 Comments)
Numerators sum also (in Numbers)
Posted on 2014-01-13 by Jer (No Solution Yet, 1 Comments)
Polycubic surface (in Shapes)
Posted on 2013-10-29 by Jer (No Solution Yet, 1 Comments)
Warm/Cool Number Guessing (in Numbers)
Posted on 2013-09-30 by Jer (No Solution Yet, 6 Comments)
2-D number guessing. (in Numbers)
Posted on 2013-09-23 by Jer (No Solution Yet, 2 Comments)
Divisibility of N (in Numbers)
Posted on 2013-06-15 by Jer (No Solution Yet, 4 Comments)
Circle on a grid 2 (in Shapes)
Posted on 2013-06-02 by Jer (No Solution Yet, 0 Comments)
Pascal's e (in Calculus)
Posted on 2013-05-29 by Jer (No Solution Yet, 1 Comments)
Circle on a grid 1 (in Shapes)
Posted on 2013-05-24 by Jer (No Solution Yet, 3 Comments)
Computer's Delight (in Cryptography) Rating: 4.00
Posted on 2013-04-14 by Jer (No Solution Yet, 1 Comments)
Stupid number trick V (in Numbers) Rating: 1.50
Posted on 2013-04-09 by Jer (No Solution Yet, 4 Comments)
Powers often in other bases. (in Numbers)
Posted on 2013-04-07 by Jer (No Solution Yet, 3 Comments)
Sine gives pi? (in Just Math) Rating: 2.00
Posted on 2013-04-02 by Jer (Solution Posted, 2 Comments)
Irrational ^ Irrational = Rational (in Numbers)
Posted on 2013-03-27 by Jer (No Solution Yet, 3 Comments)
Parabolic discovery (in Just Math)
Posted on 2013-03-25 by Jer (No Solution Yet, 1 Comments)
Repeated part divisible by 9 (in Numbers)
Posted on 2013-03-22 by Jer (No Solution Yet, 3 Comments)
All but one (in Numbers)
Posted on 2013-03-13 by Jer (Solution Posted, 2 Comments)
Touching polygons (in Shapes) Rating: 4.00
Posted on 2013-02-27 by Jer (Solution Posted, 5 Comments)
Commemorative triangles (in Sequences)
Posted on 2013-02-20 by Jer (No Solution Yet, 1 Comments)
Triangle Perimeters (in Shapes)
Posted on 2013-02-13 by Jer (No Solution Yet, 6 Comments)
Commemorations 2 (in Sequences)
Posted on 2013-02-11 by Jer (No Solution Yet, 1 Comments)
Cans in a cooler (in Shapes)
Posted on 2013-02-11 by Jer (Solution Posted, 3 Comments)
Commemorations (in Weights and Scales) Rating: 3.00
Posted on 2013-02-06 by Jer (No Solution Yet, 7 Comments)
An age conversation (in Just Math)
Posted on 2013-01-22 by Jer (No Solution Yet, 3 Comments)
Exp=log (in Just Math)
Posted on 2012-12-12 by Jer (Solution Posted, 9 Comments)
My new sequence (in Sequences)
Posted on 2012-12-08 by Jer (No Solution Yet, 6 Comments)
Transformed square (in Shapes)
Posted on 2012-10-25 by Jer (No Solution Yet, 1 Comments)
Transformed circle (in Shapes) Rating: 4.00
Posted on 2012-10-13 by Jer (No Solution Yet, 1 Comments)
9 of the same shape (in Geometry) Rating: 4.00
Posted on 2012-07-19 by Jer (No Solution Yet, 3 Comments)
Excited to win (in Probability)
Posted on 2012-06-06 by Jer (No Solution Yet, 1 Comments)
Produce More (in Numbers) Rating: 5.00
Posted on 2012-05-29 by Jer (No Solution Yet, 5 Comments)
Spherical shelter 3 (in Calculus) Rating: 4.00
Posted on 2012-05-27 by Jer (No Solution Yet, 1 Comments)
Repeated roll (in Probability)
Posted on 2012-05-25 by Jer (No Solution Yet, 4 Comments)
Spherical shelter 2 (in Calculus)
Posted on 2012-05-06 by Jer (No Solution Yet, 1 Comments)
Lean-to shelter (in Shapes)
Posted on 2012-05-03 by Jer (No Solution Yet, 5 Comments)
Spherical shelter (in Shapes)
Posted on 2012-04-27 by Jer (No Solution Yet, 2 Comments)
I can see the origin from here. (in Calculus)
Posted on 2012-03-11 by Jer (Solution Posted, 2 Comments)
Competitive number guessing (in Probability)
Posted on 2012-02-11 by Jer (No Solution Yet, 2 Comments)
Boosted board (in General) Rating: 4.00
Posted on 2012-02-07 by Jer (Solution Posted, 11 Comments)
Isosceles from Regular (in Shapes) Rating: 5.00
Posted on 2012-01-20 by Jer (Solution Posted, 13 Comments)
Another folded paper (in Shapes)
Posted on 2012-01-03 by Jer (No Solution Yet, 1 Comments)
Alternating Pascal (in Numbers)
Posted on 2011-12-08 by Jer (Solution Posted, 2 Comments)
Don't try this barefoot. (in Probability) Rating: 5.00
Posted on 2011-12-01 by Jer (No Solution Yet, 3 Comments)
Angle of view - Ellipse and Hyperbola (in Just Math) Rating: 4.00
Posted on 2011-11-24 by Jer (No Solution Yet, 7 Comments)
Angle of view - Parabola (in Geometry) Rating: 3.00
Posted on 2011-11-13 by Jer (No Solution Yet, 2 Comments)
Slope products (in Geometry)
Posted on 2011-11-08 by Jer (Solution Posted, 3 Comments)
Slow growing sequence (in Sequences)
Posted on 2011-10-20 by Jer (No Solution Yet, 1 Comments)
Concerning combinatorics (in Numbers) Rating: 4.50
Posted on 2011-10-04 by Jer (No Solution Yet, 7 Comments)
Train track shapes (in Shapes)
Posted on 2011-08-01 by Jer (Solution Posted, 2 Comments)
Fortieth logs (in Just Math) Rating: 4.50
Posted on 2011-05-31 by Jer (Solution Posted, 15 Comments)
Sequence of wrong means (in Sequences)
Posted on 2011-05-26 by Jer (Solution Posted, 3 Comments)
Chime spacing. (in Just Math)
Posted on 2011-05-12 by Jer (Solution Posted, 2 Comments)
1 penny / 1 die (in Probability)
Posted on 2011-05-06 by Jer (Solution Posted, 5 Comments)
Unconsecutive-summables (in Numbers)
Posted on 2011-04-14 by Jer (Solution Posted, 3 Comments)
Shrinkable numbers (in Numbers) Rating: 5.00
Posted on 2011-04-05 by Jer (No Solution Yet, 3 Comments)
Powerful Digit (in Probability) Rating: 4.00
Posted on 2011-03-29 by Jer (No Solution Yet, 12 Comments)
Domino Polygons (in Probability)
Posted on 2011-03-14 by Jer (No Solution Yet, 5 Comments)
Integer points on ellipses (in Geometry)
Posted on 2011-03-10 by Jer (Solution Posted, 0 Comments)
Integer points on circles. (in Geometry) Rating: 3.50
Posted on 2011-02-28 by Jer (Solution Posted, 14 Comments)
Sevenths Sliced Square (in Geometry) Rating: 3.00
Posted on 2011-02-24 by Jer (Solution Posted, 7 Comments)
Factorial zeros (in Numbers) Rating: 5.00
Posted on 2011-02-17 by Jer (No Solution Yet, 4 Comments)
Flipping Even-Odd (in Probability)
Posted on 2011-01-28 by Jer (No Solution Yet, 3 Comments)
Don't lose too fast (in Probability) Rating: 4.00
Posted on 2011-01-25 by Jer (No Solution Yet, 5 Comments)
Around the ring (in Shapes) Rating: 3.00
Posted on 2010-12-20 by Jer (No Solution Yet, 9 Comments)
Altered Parabolas (in Shapes)
Posted on 2010-12-01 by Jer (Solution Posted, 2 Comments)
Lost Logarithm (in Just Math) Rating: 3.00
Posted on 2010-11-02 by Jer (No Solution Yet, 3 Comments)
Defined Function (in Just Math) Rating: 4.00
Posted on 2010-10-24 by Jer (No Solution Yet, 4 Comments)
Which multiple of 9? (in Just Math) Rating: 4.00
Posted on 2010-09-17 by Jer (No Solution Yet, 8 Comments)
Slowing by snowing (in Numbers)
Posted on 2010-09-13 by Jer (Solution Posted, 6 Comments)
Double coded message (in Cryptography) Rating: 3.50
Posted on 2010-04-21 by Jer (Solution Posted, 2 Comments)
Limiting Mean part 3 (in Calculus)
Posted on 2010-03-14 by Jer (No Solution Yet, 1 Comments)
Limiting Mean part 2 (in Calculus) Rating: 1.00
Posted on 2010-03-10 by Jer (No Solution Yet, 2 Comments)
Squares joining quadratics (in Just Math)
Posted on 2010-02-24 by Jer (Solution Posted, 5 Comments)
Drop into the Bucket (in Shapes) Rating: 4.00
Posted on 2010-02-03 by Jer (Solution Posted, 9 Comments)
Possible Percent Problems Part 4 (in Numbers) Rating: 4.00
Posted on 2010-01-20 by Jer (No Solution Yet, 1 Comments)
Possible Percent Problems Part 3 (in Numbers)
Posted on 2010-01-15 by Jer (No Solution Yet, 2 Comments)
Possible Percent Problems Part 2 (in Numbers)
Posted on 2010-01-11 by Jer (No Solution Yet, 3 Comments)
Possible Percent Problems Part 1 (in Numbers)
Posted on 2010-01-08 by Jer (No Solution Yet, 1 Comments)
Cubic Surface (in Shapes)
Posted on 2009-12-07 by Jer (No Solution Yet, 3 Comments)
The ants go marching. (in Just Math) Rating: 4.00
Posted on 2009-10-21 by Jer (No Solution Yet, 7 Comments)
No Monochrome Arithmetic Sequence (in Numbers)
Posted on 2009-10-19 by Jer (Solution Posted, 1 Comments)
No Monochrome Sums (in Numbers)
Posted on 2009-10-14 by Jer (Solution Posted, 9 Comments)
9 points to convex pentagon (in Shapes)
Posted on 2009-10-12 by Jer (No Solution Yet, 4 Comments)
8 points no convex pentagon (in Shapes)
Posted on 2009-10-09 by Jer (Solution Posted, 4 Comments)
5 points to convex quad (in Shapes)
Posted on 2009-10-05 by Jer (Solution Posted, 4 Comments)
Fixed length from unit square. (in Shapes) Rating: 5.00
Posted on 2009-10-01 by Jer (No Solution Yet, 3 Comments)
Fractal Sequence (in Sequences)
Posted on 2009-09-18 by Jer (No Solution Yet, 1 Comments)
Unit lengths from movable points to unit triangles. (in Geometry)
Posted on 2009-09-14 by Jer (No Solution Yet, 11 Comments)
Unit lengths and triangles (in Geometry)
Posted on 2009-09-09 by Jer (No Solution Yet, 2 Comments)
Consecutive Semiprimes (in Numbers)
Posted on 2009-09-04 by Jer (Solution Posted, 2 Comments)
Random + Random + Random (in Probability)
Posted on 2009-08-28 by Jer (Solution Posted, 1 Comments)
Random +, - or / Random (in Probability)
Posted on 2009-08-24 by Jer (Solution Posted, 2 Comments)
Random x Random (in Calculus) Rating: 4.00
Posted on 2009-08-17 by Jer (No Solution Yet, 1 Comments)
Conic Spiral (in Geometry)
Posted on 2009-08-06 by Jer (Solution Posted, 2 Comments)
and W (in Word Problems) Rating: 3.00
Posted on 2009-07-14 by Jer (Solution Posted, 5 Comments)
Reverse Partridge Pandigital Set (in Numbers)
Posted on 2009-07-09 by Jer (No Solution Yet, 3 Comments)
Partridge Pandigital Set (in Numbers)
Posted on 2009-07-05 by Jer (Solution Posted, 3 Comments)
3x3 Nim (in Games) Rating: 4.00
Posted on 2009-06-25 by Jer (Solution Posted, 26 Comments)
Bounded Sine (in Shapes)
Posted on 2009-06-23 by Jer (No Solution Yet, 2 Comments)
Two way tube. (in Shapes) Rating: 1.50
Posted on 2009-06-15 by Jer (Solution Posted, 2 Comments)
Lights switched (in Logic)
Posted on 2009-06-03 by Jer (No Solution Yet, 5 Comments)
Random chord problem (in Geometry) Rating: 3.00
Posted on 2009-05-11 by Jer (Solution Posted, 15 Comments)
Bouncy Bouncy Part 3 (in Geometry)
Posted on 2009-05-04 by Jer (No Solution Yet, 1 Comments)
Hands On A Clock Part 2 (in General) Rating: 3.00
Posted on 2009-04-10 by Jer (No Solution Yet, 4 Comments)
Broken Keyboard (in Numbers) Rating: 3.00
Posted on 2009-04-06 by Jer (No Solution Yet, 1 Comments)
Derivative chains. (in Calculus)
Posted on 2009-03-29 by Jer (No Solution Yet, 6 Comments)
Skyscraper Counting (in Numbers)
Posted on 2009-03-16 by Jer (No Solution Yet, 3 Comments)
Rationalizing Decimals (in Numbers) Rating: 3.00
Posted on 2007-09-26 by Jer (Solution Posted, 8 Comments)
Slice a Circle to fit a Rectangle (in Shapes) Rating: 4.17
Posted on 2007-08-22 by Jer (No Solution Yet, 10 Comments)
Numbered Cards (in Probability) Rating: 4.00
Posted on 2007-07-23 by Jer (Solution Posted, 13 Comments)
sin(15)=sin(15) (in General) Rating: 3.33
Posted on 2007-06-25 by Jer (Solution Posted, 2 Comments)
# Wrong = % Right (in General) Rating: 3.50
Posted on 2007-06-16 by Jer (Solution Posted, 6 Comments)
Blue Moon (in Probability) Rating: 3.00
Posted on 2007-06-07 by Jer (Solution Posted, 1 Comments)
Queue weight possibilities 2. (in Numbers) Rating: 3.00
Posted on 2007-05-23 by Jer (Solution Posted, 3 Comments)
Falling through the floor (in Probability)
Posted on 2007-05-18 by Jer (No Solution Yet, 4 Comments)
Well Balanced Letter: F (in Shapes) Rating: 4.00
Posted on 2007-05-16 by Jer (No Solution Yet, 7 Comments)
Queue weight possibilities. (in Numbers)
Posted on 2007-05-15 by Jer (Solution Posted, 3 Comments)
Phidius (in Numbers) Rating: 2.50
Posted on 2007-05-11 by Jer (Solution Posted, 4 Comments)
Well Balanced Letter: C (in Shapes) Rating: 2.00
Posted on 2007-05-10 by Jer (No Solution Yet, 1 Comments)
Well Balanced Letter: V (in Shapes) Rating: 4.00
Posted on 2007-05-07 by Jer (No Solution Yet, 1 Comments)
Well Balanced Letter: E (in Shapes) Rating: 4.33
Posted on 2007-04-30 by Jer (No Solution Yet, 4 Comments)
Urn, urn, urn (in Probability) Rating: 5.00
Posted on 2007-02-20 by Jer (No Solution Yet, 5 Comments)
Pair formed Sequence (in Sequences) Rating: 4.00
Posted on 2007-02-09 by Jer (Solution Posted, 6 Comments)
Guess Again (in Probability) Rating: 3.33
Posted on 2007-01-15 by Jer (Solution Posted, 4 Comments)
Fifteen Jumbled (in Sequences) Rating: 3.00
Posted on 2006-12-29 by Jer (Solution Posted, 7 Comments)
Colored Bead Combos (in Probability) Rating: 3.00
Posted on 2006-12-17 by Jer (Solution Posted, 3 Comments)
Sum crazy dice (in Probability) Rating: 5.00
Posted on 2006-11-30 by Jer (No Solution Yet, 8 Comments)
Rack-O (in Probability) Rating: 4.67
Posted on 2006-10-10 by Jer (Solution Posted, 4 Comments)
Repeating decimals (in Numbers) Rating: 4.50
Posted on 2006-09-25 by Jer (Solution Posted, 11 Comments)
compoundwordplay (in Word Problems)
Posted on 2006-09-20 by Jer (Solution Posted, 5 Comments)
The gardener's woe is continuous (in Just Math)
Posted on 2006-08-30 by Jer (No Solution Yet, 5 Comments)
So how small is it then? (in Numbers) Rating: 4.00
Posted on 2006-08-09 by Jer (Solution Posted, 15 Comments)
Due on the 15th (in General) Rating: 3.00
Posted on 2006-08-02 by Jer (Solution Posted, 7 Comments)
Various Valleys, More Mountains (in Shapes) Rating: 2.50
Posted on 2006-07-26 by Jer (Solution Posted, 7 Comments)
Cube first, or square second (in Numbers) Rating: 4.29
Posted on 2006-07-22 by Jer (No Solution Yet, 7 Comments)
Mountains and Valleys (in Shapes) Rating: 2.50
Posted on 2006-07-19 by Jer (No Solution Yet, 9 Comments)
10 Ultimate cribbage hands (in Games) Rating: 3.33
Posted on 2006-07-18 by Jer (Solution Posted, 4 Comments)
Rising water levels (in Shapes) Rating: 4.17
Posted on 2006-06-26 by Jer (No Solution Yet, 26 Comments)
Gardener's Woe (in Just Math) Rating: 4.00
Posted on 2006-06-24 by Jer (Solution Posted, 26 Comments)
Covering a circle (extended mix) (in Shapes) Rating: 4.00
Posted on 2006-06-20 by Jer (No Solution Yet, 5 Comments)
Three Intercepts (in Just Math) Rating: 2.00
Posted on 2006-06-19 by Jer (No Solution Yet, 7 Comments)
Pythagorean chain converse (in Shapes)
Posted on 2006-06-16 by Jer (No Solution Yet, 5 Comments)
Trig meets Logs (in Numbers) Rating: 1.00
Posted on 2006-06-14 by Jer (No Solution Yet, 1 Comments)
log the log (in Just Math) Rating: 3.50
Posted on 2006-06-11 by Jer (Solution Posted, 5 Comments)
1 Palindrome 1 (in Just Math) Rating: 3.67
Posted on 2006-06-10 by Jer (Solution Posted, 8 Comments)
A dilution problem (in Just Math) Rating: 3.33
Posted on 2006-06-08 by Jer (Solution Posted, 6 Comments)
The Ultimate Cribbage Hand (in Games) Rating: 3.33
Posted on 2006-06-07 by Jer (Solution Posted, 21 Comments)
Who? (in Cryptography) Rating: 3.00
Posted on 2006-06-04 by Jer (Solution Posted, 7 Comments)
Math Rebuses (Rebi?) (in Word Problems) Rating: 3.00
Posted on 2006-06-01 by Jer (Solution Posted, 8 Comments)
Coin through a hole (in Shapes) Rating: 3.00
Posted on 2006-05-29 by Jer (Solution Posted, 24 Comments)
Domino arrangements (in General) Rating: 3.67
Posted on 2006-05-27 by Jer (Solution Posted, 7 Comments)
Domino fractions (in Numbers) Rating: 3.00
Posted on 2006-05-25 by Jer (Solution Posted, 2 Comments)
Unfilled grid (in General) Rating: 4.14
Posted on 2006-05-23 by Jer (Solution Posted, 5 Comments)
Circumferential distances (in General) Rating: 3.50
Posted on 2006-05-21 by Jer (Solution Posted, 2 Comments)
Mutually disagreeing queens. (in General) Rating: 4.00
Posted on 2006-05-19 by Jer (No Solution Yet, 5 Comments)
ABCDEABCDE is one (in General) Rating: 4.50
Posted on 2006-05-17 by Jer (Solution Posted, 3 Comments)
Square dissection (in Shapes) Rating: 3.67
Posted on 2006-05-16 by Jer (Solution Posted, 4 Comments)
Cubes in a tin (in Shapes) Rating: 2.67
Posted on 2006-05-15 by Jer (Solution Posted, 23 Comments)
Garden Path (in Geometry) Rating: 3.67
Posted on 2006-05-10 by Jer (Solution Posted, 11 Comments)
Squares in a cross (in General)
Posted on 2006-05-10 by Jer (Solution Posted, 5 Comments)
Tidy Triangle (in Shapes)
Posted on 2006-05-05 by Jer (Solution Posted, 7 Comments)
Square = half itself? (in Shapes) Rating: 3.00
Posted on 2006-05-04 by Jer (Solution Posted, 19 Comments)
A Maypole Problem (in Geometry) Rating: 2.50
Posted on 2006-05-01 by Jer (Solution Posted, 7 Comments)
100 squares (in Shapes) Rating: 4.00
Posted on 2006-04-30 by Jer (Solution Posted, 6 Comments)
Assigning a wonky die (in Probability) Rating: 3.00
Posted on 2006-04-28 by Jer (Solution Posted, 4 Comments)
3 in a row = bad (in General) Rating: 4.50
Posted on 2006-04-26 by Jer (Solution Posted, 13 Comments)
Figuring a wonky die (in Probability) Rating: 3.00
Posted on 2006-04-24 by Jer (Solution Posted, 5 Comments)
Walking the Edge Part 2 (in Shapes)
Posted on 2006-04-20 by Jer (No Solution Yet, 7 Comments)
Walking the Edge (in Shapes)
Posted on 2006-04-18 by Jer (No Solution Yet, 4 Comments)
Remainders (in Numbers) Rating: 3.50
Posted on 2006-04-15 by Jer (Solution Posted, 3 Comments)
That's a lotta numbers! (in Numbers) Rating: 3.25
Posted on 2006-04-14 by Jer (Solution Posted, 10 Comments)
RIP (in General) Rating: 2.00
Posted on 2006-04-13 by Jer (Solution Posted, 6 Comments)
3's & 7's (in Numbers) Rating: 3.25
Posted on 2006-04-09 by Jer (Solution Posted, 13 Comments)
Two fours (or fewer?) (in Numbers) Rating: 4.00
Posted on 2006-04-07 by Jer (Solution Posted, 15 Comments)
Sum and Product reversal (in Numbers) Rating: 3.50
Posted on 2006-04-05 by Jer (Solution Posted, 6 Comments)
Don't drink and run (in Tricks) Rating: 3.00
Posted on 2006-04-03 by Jer (Solution Posted, 5 Comments)
Lack of transport (in General) Rating: 3.75
Posted on 2006-03-31 by Jer (Solution Posted, 6 Comments)
Walking down an escalator (in General) Rating: 3.33
Posted on 2006-03-29 by Jer (No Solution Yet, 10 Comments)
3 grandfather clock problems (in General) Rating: 3.00
Posted on 2006-03-27 by Jer (No Solution Yet, 9 Comments)
3 age problems (in Just Math) Rating: 3.00
Posted on 2006-03-24 by Jer (Solution Posted, 5 Comments)
Bouncy Bouncy revisited (in Just Math) Rating: 1.50
Posted on 2006-03-23 by Jer (No Solution Yet, 1 Comments)
Rotating slopes (in Just Math) Rating: 3.20
Posted on 2006-03-21 by Jer (Solution Posted, 5 Comments)
Pythagorean Chain (in Shapes) Rating: 3.50
Posted on 2006-03-20 by Jer (Solution Posted, 18 Comments)
Simple Origami? (in Shapes) Rating: 4.00
Posted on 2006-03-07 by Jer (No Solution Yet, 8 Comments)
Bouncy Bouncy part 2 (in Calculus) Rating: 4.50
Posted on 2006-02-10 by Jer (Solution Posted, 14 Comments)
Bouncy Bouncy Part 1 (in Geometry) Rating: 4.00
Posted on 2006-02-08 by Jer (Solution Posted, 10 Comments)
A cute little angle to find (in Geometry) Rating: 3.67
Posted on 2006-01-18 by Jer (Solution Posted, 7 Comments)
D on its side (in Shapes) Rating: 4.33
Posted on 2006-01-16 by Jer (Solution Posted, 13 Comments)
Stupid number trick IV (in Numbers) Rating: 4.00
Posted on 2006-01-13 by Jer (Solution Posted, 23 Comments)
Stupid number trick III (in Numbers) Rating: 4.00
Posted on 2006-01-11 by Jer (Solution Posted, 11 Comments)
Stupid number trick II (in Numbers) Rating: 3.67
Posted on 2006-01-02 by Jer (Solution Posted, 6 Comments)
Stupid number trick (in Numbers) Rating: 2.33
Posted on 2005-12-01 by Jer (Solution Posted, 8 Comments)
Not shaken, not stirred, but stable. (in Calculus) Rating: 2.00
Posted on 2005-09-10 by Jer (Solution Posted, 6 Comments)
A quadrilateral query (in Geometry) Rating: 3.00
Posted on 2005-08-29 by Jer (Solution Posted, 5 Comments)
The folly of war part 1: Knights (in Probability) Rating: 3.40
Posted on 2005-08-23 by Jer (Solution Posted, 23 Comments)
Digit Sequence (in Sequences) Rating: 3.63
Posted on 2005-06-28 by Jer (Solution Posted, 15 Comments)
Are we odd for liking this? (in Cryptography) Rating: 4.30
Posted on 2005-06-09 by Jer (Solution Posted, 12 Comments)
Discriminants (in Numbers) Rating: 3.33
Posted on 2005-05-24 by Jer (Solution Posted, 7 Comments)
Silly System (in Numbers) Rating: 2.75
Posted on 2005-05-16 by Jer (Solution Posted, 6 Comments)
Radically confusing (in Numbers) Rating: 1.43
Posted on 2005-05-14 by Jer (Solution Posted, 15 Comments)
Create the equation (in Numbers) Rating: 2.43
Posted on 2005-05-09 by Jer (Solution Posted, 10 Comments)
Inscribed Triangle (in Geometry) Rating: 1.00
Posted on 2005-05-07 by Jer (Solution Posted, 4 Comments)
Make it solvable (in Numbers) Rating: 3.67
Posted on 2005-05-05 by Jer (Solution Posted, 16 Comments)
String length differences (in General) Rating: 4.00
Posted on 2005-02-15 by Jer (Solution Posted, 4 Comments)
Reverse and Differ (in Numbers) Rating: 2.00
Posted on 2005-02-01 by Jer (Solution Posted, 6 Comments)
A Curious Cone (in Geometry) Rating: 2.25
Posted on 2004-10-11 by Jer (Solution Posted, 12 Comments)
Third Squared (in Shapes) Rating: 4.25
Posted on 2004-09-15 by Jer (Solution Posted, 7 Comments)

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