# Fun with Numbers

Numbers have been studied as long as there has been writing systems. From the Babylonians to the Greeks, from Eratosthenes to Euler, numbers have fascinated people for ages. Our current fun with numbers series.

1. Fun with numbers #1   –   Division by three
2. Fun with numbers #2   –   Pythagorean Theorem
3. Fun with numbers #3   –   Collatz Conjecture
4. Fun with numbers #4   –   Bisection method for square root 2
5. Fun with numbers #5   –   Palindrome pyramid
6. Fun with numbers #6   –   Parabola sieve
7. Fun with numbers #7   –   Palindrome pyramid 2
8. Fun with numbers #8   –   The number 113
9. Fun with numbers #9   –   Divisible by 11
10. Fun with numbers #10 –   1089 magic trick
11. Fun with numbers #11  –   The remainders of 2519
12. Fun with numbers #12 –   Gauss and the Triangular Number
13. Fun with numbers #13 –   Tetrahedral Numbers
14. Fun with numbers #14 –  Pyramidal Numbers
15. Fun with numbers #15 –  Amicable Numbers
16. Fun with numbers #16 – Narcissistic Numbers
17. Fun with numbers #17 –  Perfect Numbers
18. Fun with numbers #18 –  Dyadic Numbers in Music
19. Fun with numbers #19 –  Catalan Numbers and Counting
20. Fun with number #20  –  Constructible Numbers