Amazing Number Facts Index Page

The Index

1	Sums of squares then sums of cubes then...
2	Perfect numbers and sums of odd cubes
3	Odd triangles
4	Powers of triangular numbers
5	All the ones
6	Factors of factors
7	The powerful six
8	Square factor sums
9	Wilson's pattern
10	37 times
11	A prime rich formulae
12	Harmonic numbers and primes
13	The number 21322314
14	Pascal's triangle and the Catalan numbers
15	Reverse decimal repeaters
16	More prime rich formulae
17	Square triangular numbers
18	Chopping for prime numbers
19	Pythagorean triples
20	Fangs for the vampire numbers
21	Division test for elevens
22	Armstrong numbers
23	Primes in arithmetic sequence
24	Sort, reverse and subtract (Kaprekar)
25	Add and times are the same
26	This continues or does it?
27	All nine digits
28	The largest known prime
29	Seven multiplications and a bit more
30	The multiples of root 2
31	Powerful sums
32	The first 206 billion decimal places of Pi
33	Golden primes
34	The Sieve of Eratosthenes
35	A prime-rich decade
36	Cabalistic Numerology
37	The 29th February
38	Fibonacci's Brothers
39	Square Permutations
40	The Divided Sum
41	The Beastly Number
42	Smith Numbers
43	Ordered Digital Equations
44	The Ultimate Palindrome
45	Square Products Minus 1
46	Bulgarian Patience
47	This doesn't continue or does it?
48	Very Large Number Contest
49	Repfigits
50	The Day Formula
51	Zig Zag Numbers
52	Counting to Infinity and Beyond
53	Unrepeatable Digits
54	Rabbit Numbers
55	Benjamin Franklin's Magic Square
56	A Mathematical Limerick
57	Polygonal Numbers
58	Morel's Triangle