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 (1)> Games> Paradoxes> Riddles
> Just Math (1)> Science> Algorithms
How many perfect cubes below 10^6 can be expressed as the sum of two or more unique integer factorials ?

List them all.

Examples: 2!+3!=8; 1!+2!+4!=27.

Rem: 0! is not allowed.

(No Solution Yet, 1 Comments) Submitted on 2018-06-23 by Ady TZIDON   
Difficulty: 2 of 5 Bonus: Mutually disagreeing queens. (in General) Rating: 4.00
In how many ways can two queens be placed on a chessboard such that they are mutually attacking each other?

Show how to solve this problem quickly with only pencil and paper (not even a calculator).

(No Solution Yet, 5 Comments) Submitted on 2006-05-19 by Jer   
Difficulty: 3 of 5Sum of reciprocals (in Just Math)
Posted on 2018-06-22 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 53 cubes (in Numbers)
Posted on 2018-06-21 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Non-zero integers (in Just Math)
Posted on 2018-06-20 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 4 of 5Space guys (in Just Math)
Posted on 2018-06-19 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Counting ones (in Just Math)
Posted on 2018-06-18 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Square Divisiblity (in Numbers) Rating: 3.00
Posted on 2018-06-17 by Daniel (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Zero is the last digit of S (in Numbers) Rating: 5.00
Posted on 2018-06-16 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 4 of 5Play until you win (in Probability)
Posted on 2018-06-15 by Jer (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Looking for a square result (in Just Math)
Posted on 2018-06-14 by Ady TZIDON (No Solution Yet, 18 Comments)
Difficulty: 2 of 5Cypher Phrase (in Cryptography) Rating: 3.00
Posted on 2018-06-13 by Charlie (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Cubes of couples (in Numbers)
Posted on 2018-06-12 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Evaluate probability (in Probability)
Posted on 2018-06-11 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5How fast can you solve it? (in Just Math)
Posted on 2018-06-10 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Cyclic Quadrilateral Tessellation (in Geometry)
Posted on 2018-06-09 by Jer (No Solution Yet, 0 Comments)

Recently Posted Solutions:
Difficulty: 4 of 5Ascending order (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-06-08 11:11:03
Difficulty: 3 of 5How many drinks do you need? (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-06-08 11:06:28
Difficulty: 3 of 5Using its own digits (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-06-04 08:30:25
Difficulty: 3 of 5Thinking octal (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-06-02 15:54:25
Difficulty: 3 of 5Perpendicular Incenters (in Geometry)
Submitted By Bractals. Solution posted on 2018-06-01 16:06:11
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 (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information