All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info
Home
Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
> Logic> Probability> Shapes> General (1)
> Numbers (1)> Games> Paradoxes> Riddles
> Just Math (1)> Science> Algorithms
Before trying the problem "note your opinion as to whether the observed pattern is known to continue, known not to continue, or not known at all."

For integers greater than 1,
2n is never congruent to 1 (mod n)
2n is congruent to 2 (mod n) whenever n is prime, and sometimes when it isn't,
is 2n ever congruent to 3 (mod n)?

(No Solution Yet, 2 Comments) Submitted on 2017-09-24 by Jer   
Difficulty: 2 of 5 Bonus: 35, 70, 105, 140... (in Numbers) Rating: 3.00
Find the smallest positive integer that is a multiple of 35 whose digits are all the same.
(Solution Posted, 8 Comments) Submitted on 2006-05-03 by Rob   
Difficulty: 4 of 5Solve the alpha2etic ! (in Just Math)
Posted on 2017-09-23 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 4 of 53 by 3 by 5 (in Word Problems)
Posted on 2017-09-22 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Does it continue? 4: Euclid's next prime (in Numbers)
Posted on 2017-09-21 by Jer (No Solution Yet, 3 Comments)
Difficulty: 2 of 5The next five... (in Sequences)
Posted on 2017-09-20 by Charlie (Solution Posted, 2 Comments)
Difficulty: 3 of 5Does it continue? 3: Growing table of primes (in Numbers)
Posted on 2017-09-19 by Jer (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Parabolic Numbers (in Just Math)
Posted on 2017-09-18 by Charlie (Solution Posted, 2 Comments)
Difficulty: 3 of 5Proving an inequality (in Geometry)
Posted on 2017-09-17 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Does it continue? 2: Prime or not? (in Numbers) Rating: 5.00
Posted on 2017-09-16 by Jer (No Solution Yet, 6 Comments)
Difficulty: 4 of 5Reverse Engineering (in General)
Posted on 2017-09-15 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Cryptaquote I (in Word Problems) Rating: 5.00
Posted on 2017-09-14 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 2 of 5Does it continue? 1: Chord regions (in Sequences)
Posted on 2017-09-13 by Jer (No Solution Yet, 9 Comments)
Difficulty: 3 of 5Sans squares (in Sequences)
Posted on 2017-09-12 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5MMMMMM Donut (in Just Math)
Posted on 2017-09-11 by Jer (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Lots of lods (in Sequences) Rating: 4.67
Posted on 2017-09-10 by Ady TZIDON (No Solution Yet, 7 Comments)

Recently Posted Solutions:
Difficulty: 2 of 5The next five... (in Sequences)
Submitted By Charlie. Solution posted on 2017-09-23 13:39:52
Difficulty: 2 of 5Parabolic Numbers (in Just Math)
Submitted By Charlie. Solution posted on 2017-09-23 13:39:25
Difficulty: 4 of 5Parallelograms (in Geometry)
Submitted By Bractals. Solution posted on 2017-09-19 16:26:36
Difficulty: 3 of 5Topical Quotation VII (in Word Problems)
Submitted By Charlie. Solution posted on 2017-09-11 14:15:01
Difficulty: 3 of 5Fifty-fifty? (in Probability)
Submitted By Ady TZIDON. Solution posted on 2017-09-06 02:18:00
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information