[math-fun] Favourite prime numbers

((( My favorite number is 24 hands down, because of its amazing properties like showing up in Dedekind eta, 1^2 + ... + 24^2 = 70^2 being the only such relation, the 24-dimensional Leech lattice, and 24 being the largest number N such that all smaller numbers K with GCD(K,N) = 1 satisfy K^2 == 1 (mod N). At least some of these are interconnected. ))) But how about prime numbers? After the first few, how do you distinguish, say, 101, 103, 107, 109 ? Are there standard measures of some sort that distinguish among prime numbers? --Dan Sometimes the brain has a mind of its own.