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Difficulty: 3 of 5Prime Lottery (in Games)
Posted on 2024-04-03 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5What Number Comes Next (in Numbers) Rating: 5.00
Posted on 2024-03-31 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 53 3s times 3 3s has 9 9s (in Numbers) Rating: 5.00
Posted on 2024-03-24 by Larry (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Atbash Self Referential Number (in Numbers)
Posted on 2024-02-27 by Larry (Solution Posted, 4 Comments)
Difficulty: 3 of 5Multiplication Includes All Digits (in Numbers)
Posted on 2024-02-16 by Larry (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Another Four Reals (in Numbers)
Posted on 2024-01-17 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Connected Names (in Word Problems)
Posted on 2023-12-20 by Larry (Solution Posted, 3 Comments)
Difficulty: 3 of 5Sounds Mathematical (in Word Problems)
Posted on 2023-12-14 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5Bug on a Cube 4 (in Probability)
Posted on 2023-12-08 by Larry (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Bug on a Cube 3 (in Probability)
Posted on 2023-12-05 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Lighthouse Kerfuffle (in Probability)
Posted on 2023-12-02 by Larry (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Letter Categories (in Shapes)
Posted on 2023-11-29 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5N^2 and N^3 (in Numbers) Rating: 5.00
Posted on 2023-11-03 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 596 Tees (in Numbers)
Posted on 2023-11-01 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5EMIRP pair inside a PRIME (in Numbers)
Posted on 2023-10-19 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5n-Pandigital and k-Divisible (in Numbers)
Posted on 2023-10-08 by Larry (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Concatenated Pandigital (in Numbers)
Posted on 2023-09-23 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Reversing Minute Hand Clock (in Just Math)
Posted on 2023-09-19 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Maximize Rectangle on Semicircle in Triangle (in Calculus)
Posted on 2023-08-08 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Seven-digit Number (in Numbers) Rating: 5.00
Posted on 2023-07-28 by Larry (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Concatenate Three Primes, Make Six Primes (in Numbers)
Posted on 2023-07-20 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Included in both A^B and B^A (in Numbers)
Posted on 2023-06-01 by Larry (Solution Posted, 1 Comments)
Difficulty: 3 of 5Pandigital W numbers (in Numbers)
Posted on 2023-05-30 by Larry (Solution Posted, 4 Comments)
Difficulty: 3 of 5Phrasing Frustration (in Word Problems)
Posted on 2023-05-29 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 518 Integers, 36 digits (in Numbers)
Posted on 2023-05-19 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Digits of π in π^2 (in Numbers)
Posted on 2023-04-27 by Larry (Solution Posted, 1 Comments)
Difficulty: 3 of 5Roman WORD2NUM (in Word Problems)
Posted on 2023-04-12 by Larry (Solution Posted, 4 Comments)
Difficulty: 3 of 5Ternary Multiplication Algorithm (in Algorithms) Rating: 5.00
Posted on 2023-03-24 by Larry (Solution Posted, 2 Comments)
Difficulty: 2 of 5What is Half and Half (in Riddles) Rating: 4.00
Posted on 2023-03-09 by Larry (Solution Posted, 6 Comments)
Difficulty: 3 of 5Triplet Trouble (in Sequences)
Posted on 2023-02-23 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5sod(N) = pod(sqrt(N)) (in Numbers)
Posted on 2023-02-09 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Integers with Happy, Healthy Babies (in Numbers)
Posted on 2023-01-26 by Larry (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Fibonacci Lengths (in Numbers)
Posted on 2023-01-16 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5Special Words 3 (in Word Problems) Rating: 5.00
Posted on 2022-12-04 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5From sum to addends 2 (in Numbers) Rating: 5.00
Posted on 2022-07-28 by Larry (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Perfect Powers with no Repeat Digits (in Numbers) Rating: 5.00
Posted on 2022-07-22 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Spellements 2 (in General) Rating: 4.00
Posted on 2022-07-15 by Larry (No Solution Yet, 12 Comments)
Difficulty: 3 of 5Spellements (in General)
Posted on 2022-07-09 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5SOD(power) = power (in Numbers) Rating: 5.00
Posted on 2022-07-07 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5A Pair of Factorial Quartic Equations (in Numbers) Rating: 4.00
Posted on 2022-07-02 by Larry (Solution Posted, 4 Comments)
Difficulty: 4 of 5West of Evan, East of Odin (in Numbers)
Posted on 2022-06-29 by Larry (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Why Eat? (in Word Problems) Rating: 5.00
Posted on 2022-06-20 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5Primorial Penultimate Piece (in Numbers) Rating: 5.00
Posted on 2022-06-14 by Larry (No Solution Yet, 2 Comments)
Difficulty: 4 of 5Arithmetic Derivative (in Numbers) Rating: 5.00
Posted on 2022-06-10 by Larry (No Solution Yet, 7 Comments)
Difficulty: 3 of 5What did I do wrong? (in Numbers) Rating: 5.00
Posted on 2022-04-22 by Larry (Solution Posted, 4 Comments)
Difficulty: 3 of 53 Pals make a Pal (in Numbers) Rating: 5.00
Posted on 2022-04-20 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Move the digit, Change the base (in Numbers) Rating: 5.00
Posted on 2022-04-19 by Larry (No Solution Yet, 10 Comments)
Difficulty: 3 of 5Flipflop the digits, octuple the number (in Numbers) Rating: 5.00
Posted on 2022-03-30 by Larry (No Solution Yet, 5 Comments)
Difficulty: 4 of 5Difference is sod sum (in Numbers) Rating: 4.00
Posted on 2022-01-28 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Powers of 3, 4, and 7 Included (in Numbers) Rating: 4.00
Posted on 2022-01-10 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 5function of s.o.d. of prime (in Numbers) Rating: 4.00
Posted on 2021-12-31 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5Factorion plus one: Factoritwo (in Numbers) Rating: 5.00
Posted on 2021-12-16 by Larry (Solution Posted, 2 Comments)
Difficulty: 2 of 5Product of odd primes with distinct digits (in Numbers) Rating: 5.00
Posted on 2021-07-23 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 5Three Signs and Constant Speed (in Just Math) Rating: 5.00
Posted on 2021-07-08 by Larry (Solution Posted, 2 Comments)
Difficulty: 4 of 5Reversible Cubes (in Numbers) Rating: 5.00
Posted on 2021-06-29 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 5There Can Be Only Twelve (in Word Problems) Rating: 5.00
Posted on 2021-06-10 by Larry (Solution Posted, 4 Comments)
Difficulty: 3 of 5quadratic ^ quadratic (in General) Rating: 4.00
Posted on 2021-04-06 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 5Solitaire: Probability Of No First Move (in Probability)
Posted on 2021-01-12 by Larry (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Concatenation equals Sum of Squares (in Numbers)
Posted on 2020-12-01 by Larry (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Exponentiation Equals Concatenation (in Numbers) Rating: 3.00
Posted on 2020-11-14 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Concatenation of Prime Factors is Pandigital (in Numbers)
Posted on 2020-10-15 by Larry (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Just an Average sequence (in Sequences)
Posted on 2020-09-29 by Larry (No Solution Yet, 1 Comments)
Difficulty: 4 of 5Square to Cone Conversion (in Shapes)
Posted on 2020-09-12 by Larry (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Sums of Sums of Triangular Numbers (in Just Math) Rating: 4.50
Posted on 2020-09-05 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5Average Of Digits of powers (in Numbers) Rating: 3.00
Posted on 2020-08-20 by Larry (No Solution Yet, 7 Comments)
Difficulty: 3 of 5Three Digit Number 3 (in Numbers)
Posted on 2020-08-05 by Larry (No Solution Yet, 5 Comments)
Difficulty: 4 of 5Accelerating Sequence (in Sequences)
Posted on 2020-07-24 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Two Digit Average 2 (in Numbers) Rating: 5.00
Posted on 2020-04-15 by Larry (Solution Posted, 2 Comments)
Difficulty: 2 of 53-Digit Sequence in a Grid (in Sequences) Rating: 5.00
Posted on 2020-04-06 by Larry (Solution Posted, 3 Comments)
Difficulty: 2 of 5p(Ascending Number) closest to .01 (in Probability)
Posted on 2020-03-16 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5The Celebrated Jumping Frog of Perplexus County (in Probability)
Posted on 2020-03-04 by Larry (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Three Squares make a Triangle (in Shapes) Rating: 3.00
Posted on 2019-12-23 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5NARROW + STREET = AVENUE (in Numbers) Rating: 4.33
Posted on 2019-11-27 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5SOD cubed equals Sum of Squares of SODs (in Numbers) Rating: 4.00
Posted on 2019-11-20 by Larry (Solution Posted, 4 Comments)
Difficulty: 2 of 5What's Seven Got To Do With It? (in Sequences) Rating: 3.00
Posted on 2018-05-14 by Larry (Solution Posted, 2 Comments)
Difficulty: 3 of 5A Common Number (in Just Math)
Posted on 2018-05-09 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 5Find a Few Functions (in Calculus) Rating: 4.00
Posted on 2018-04-15 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5N dice (in Probability) Rating: 3.50
Posted on 2017-05-25 by Larry (Solution Posted, 3 Comments)
Difficulty: 3 of 5Defrosting the Cone (in Calculus) Rating: 3.00
Posted on 2014-10-02 by Larry (No Solution Yet, 1 Comments)
Difficulty: 2 of 5One up (in Probability) Rating: 3.00
Posted on 2014-08-22 by Larry (Solution Posted, 1 Comments)
Difficulty: 4 of 5Fun Function (in Calculus)
Posted on 2010-11-23 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Circles and Polygons (in Just Math)
Posted on 2010-09-05 by Larry (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Squares Probability III (in Just Math)
Posted on 2010-08-19 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Three Lock Box (in Geometry)
Posted on 2010-07-19 by Larry (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Make A Fib (in Just Math)
Posted on 2010-07-09 by Larry (No Solution Yet, 8 Comments)
Difficulty: 5 of 5Cover the Center (in Geometry)
Posted on 2010-06-04 by Larry (No Solution Yet, 6 Comments)
Difficulty: 4 of 5Cover the Circumference (in Geometry)
Posted on 2010-05-25 by Larry (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Cross the Circle (in Geometry)
Posted on 2010-05-23 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Another hour-glass (in Shapes)
Posted on 2010-03-15 by Larry (No Solution Yet, 3 Comments)
Difficulty: 3 of 5More Consecutive Semiprimes (in Numbers)
Posted on 2009-09-08 by Larry (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Equal Maxes (in Calculus) Rating: 3.00
Posted on 2007-06-12 by Larry (Solution Posted, 6 Comments)
Difficulty: 3 of 5The Day of the Locus (in Shapes) Rating: 4.00
Posted on 2006-12-07 by Larry (Solution Posted, 3 Comments)
Difficulty: 4 of 5Hoop Dreams (in Science) Rating: 4.00
Posted on 2006-11-10 by Larry (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Mister Resistor (in Science) Rating: 4.67
Posted on 2006-11-03 by Larry (Solution Posted, 108 Comments)
Difficulty: 3 of 5The Holy Cannoli (in Shapes) Rating: 4.50
Posted on 2006-11-01 by Larry (No Solution Yet, 8 Comments)
Difficulty: 3 of 5The Infinite Drive (in Science) Rating: 3.50
Posted on 2006-02-18 by Larry (Solution Posted, 5 Comments)
Difficulty: 1 of 5Silly Sphere (in Tricks) Rating: 4.33
Posted on 2005-12-27 by Larry (Solution Posted, 9 Comments)
Difficulty: 1 of 5What number? (in Tricks) Rating: 4.33
Posted on 2005-12-16 by Larry (Solution Posted, 6 Comments)
Difficulty: 3 of 5Good Morning (in Cryptography) Rating: 3.67
Posted on 2005-11-17 by Larry (Solution Posted, 7 Comments)
Difficulty: 3 of 5ZGYZHS (in Cryptography) Rating: 3.50
Posted on 2005-11-11 by Larry (Solution Posted, 5 Comments)
Difficulty: 2 of 5Microwave Math (in Just Math) Rating: 3.50
Posted on 2005-11-08 by Larry (Solution Posted, 8 Comments)
Difficulty: 1 of 5Trigonometry Nest 2 (in Just Math) Rating: 3.00
Posted on 2005-11-07 by Larry (Solution Posted, 7 Comments)
Difficulty: 4 of 5Fade sequence (in Sequences) Rating: 3.50
Posted on 2005-10-26 by Larry (Solution Posted, 5 Comments)
Difficulty: 3 of 52nd difference sequence (in Sequences) Rating: 3.50
Posted on 2005-10-22 by Larry (Solution Posted, 11 Comments)
Difficulty: 2 of 5Proper sequence (in Sequences) Rating: 2.50
Posted on 2005-10-05 by Larry (Solution Posted, 19 Comments)
Difficulty: 3 of 5String and Wood (in Shapes) Rating: 3.00
Posted on 2005-08-08 by Larry (Solution Posted, 6 Comments)
Difficulty: 2 of 5MovieMadness (in Sequences) Rating: 2.00
Posted on 2005-07-20 by Larry (Solution Posted, 22 Comments)
Difficulty: 3 of 5Word2Num (in Cryptography) Rating: 4.00
Posted on 2005-07-15 by Larry (Solution Posted, 9 Comments)
Difficulty: 2 of 5Cartoon Prison (in Cryptography) Rating: 4.40
Posted on 2005-05-21 by Larry (Solution Posted, 12 Comments)
Difficulty: 2 of 5TNR (in Cryptography) Rating: 4.39
Posted on 2005-05-18 by Larry (Solution Posted, 7 Comments)
Difficulty: 2 of 5Underwater Sound Localization (in Science) Rating: 4.00
Posted on 2005-04-14 by Larry (Solution Posted, 17 Comments)
Difficulty: 3 of 5Tethered satellites (in Science) Rating: 3.50
Posted on 2005-04-13 by Larry (Solution Posted, 13 Comments)
Difficulty: 3 of 5Sequence E.T. cetera (in Cryptography) Rating: 3.33
Posted on 2005-04-05 by Larry (Solution Posted, 11 Comments)
Difficulty: 3 of 5Firing Line (in Algorithms) Rating: 3.75
Posted on 2004-08-25 by Larry (Solution Posted, 16 Comments)
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