47

This number is a prime.

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The surprising formula for primes proposed by J. Minac and C. Willans in 1995 had 47 symbols. This formula, based on Wilson theorem, gives all the primes successively and without repetition, but unfortunately is not very convenient. [Capelle]

Submitted: 2003-06-19 11:14:26; Last Modified: 2008-01-30 17:28:00.