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The nth Prime Page will now find any of the first 2.623˙10^{15} primes or
π(x) for x up to 10^{17}. 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] It is conjectured that 491 is the smallest prime not of the form x^{3} + y^{3} + 2z^{3}. [Wesolowski]
(There are 4 curios for this number that have not yet been approved by an editor.) To link to this page use /curios/page.php?number_id=4088
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