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
> Numbers> Games> Paradoxes (1)> Riddles
> Just Math (3)> Science> Algorithms
Most people have fewer friends than
their friends have, on average.

Prove it.

(No Solution Yet, 1 Comments) Submitted on 2014-10-31 by Ady TZIDON   
Difficulty: 1 of 5 Bonus: 00 Separate (in Just Math) Rating: 3.00
Prove that the numbers that begin with 1 and end with 1, with any number of 2s in the middle, and all 1s and 2s separated by 00 are composite.

For example:
1002001
1002002001,
1002002002001,
1002002002002001
(Solution Posted, 13 Comments) Submitted on 2003-10-10 by Gamer   
Difficulty: 3 of 5Chairs galore (in Just Math)
Posted on 2014-10-31 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Identical Digit Baffle II (in Just Math)
Posted on 2014-10-30 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 1 of 5Reply to this (in Just Math)
Posted on 2014-10-30 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 5 of 5Random^Random (in Probability)
Posted on 2014-10-29 by Jer (No Solution Yet, 8 Comments)
Difficulty: 3 of 5Letter Deletion Deduction (in Word Problems)
Posted on 2014-10-29 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Angle evaluating (in Geometry)
Posted on 2014-10-28 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Analyzing change (in Just Math) Rating: 3.00
Posted on 2014-10-28 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Hat #9 (in Word Problems)
Posted on 2014-10-27 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Word Containment Contemplation (in Word Problems)
Posted on 2014-10-27 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 5 of 5Spacy Colors II (in General)
Posted on 2014-10-26 by Bractals (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Uncommonly Common (in Riddles)
Posted on 2014-10-25 by K Sengupta (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Area Ascertainment II (in Shapes) Rating: 4.00
Posted on 2014-10-24 by K Sengupta (No Solution Yet, 8 Comments)
Difficulty: 2 of 5Performance Probe (in Logic)
Posted on 2014-10-24 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Curious concatenations (in Numbers)
Posted on 2014-10-23 by Ady TZIDON (No Solution Yet, 1 Comments)

Recently Posted Solutions:
Difficulty: 1 of 5One by two (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2014-10-27 11:50:38
Difficulty: 3 of 5Conic Triangle (in Geometry)
Submitted By Bractals. Solution posted on 2014-10-18 11:08:54
Difficulty: 3 of 5Guessing ages (in Tricks)
Submitted By Ady TZIDON. Solution posted on 2014-10-15 11:07:24
Difficulty: 3 of 5Circles at a point. (in Geometry)
Submitted By broll. Solution posted on 2014-10-14 07:40:35
Difficulty: 3 of 5Next word, please (in Sequences)
Submitted By Ady TZIDON. Solution posted on 2014-10-12 22:44:24
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 (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2014 by Animus Pactum Consulting. All rights reserved. Privacy Information