pi(x) is the mathematical notation for "the number of prime numbers
less than or equal to x". So pi(53) is 16, since there are 16
primes less than or equal to 53
(2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53).
I must admit I'd never seen the original proposition that Theresa
wrote about. Now I have to go find out if it's a conjecture, and if
not, the proof! Another couple of hours to waste!
Cheers, Julian
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