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21757820799 (another Prime Pages' Curiosity) |
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21757820799 = 3*11*13*683*74257 = 3111368374257/143 is the
second number which divides the concatenation of its prime
factors. The first such number is 28749. The third is
unknown as of 2009 but 119 large
solutions are known based on a method using
factorizations of 10^b+1. [Andersen]
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