The book is now available! 491
(another Prime Pages' Curiosity)
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Participate: 		+ The smallest irregular prime having an irregularity index of 3. [Noe]

+ 491 is a Sophie Germain prime. 491 is also a divisor of a Generalized Fermat Number, as 491 * (2^123281+1) divides GF(123280,10) = 10^(2^123280) + 1. [Carmichael]

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