Number Gossip
(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)
Unique Properties of 169
- 169 is the first composite Pell number with a prime index
- 169 is the smallest 3-digit square whose digits are increasing
- 169 is the smallest square that is prime when turned upside down (691)
- 169 is the number of nonequivalent starting hands in Texas hold 'em
- 169 is the smallest index of a prime number that shares the first digit with the prime number (169-th prime number is 1009)
- 169 is the smallest square that is a difference between two cubes (169 = 83 - 73)
- 169 is the smallest odd winning position in Fibonacci nim
- 169 is the smallest square such that the next squares is an anagram of its digits
- 169 is the smallest multi-digit reversible perfect power with all different digits: 169 and its reverse, 961, are both squares