The book is now available! 1983163
(another Prime Pages' Curiosity)
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+ The smallest number, all of whose prime factors are of form 6n+1, whose sum of distinct prime factors is prime: 1983163 = 7 * 13 * 19 * 31 * 37, and 7 + 13 + 19 + 31 + 37 = 107 is prime. [Post]




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