57
(another Prime Pages' Curiosity)
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Participate:
+ pi(57) = 24 and 5757 - 24 is prime. [Noll]

+ 57 x 225 - 1 is prime. [Noll]

+ 100 x 2n + 57 are primes for n = -1, 0, 1, 2, 3, 4 & 5. [Luhn]




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