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Single Curio View: (Seek other curios for this number) All Mersenne primes are of the from 2^k  1, and k must be prime. For 8191, k=13. The case of k=11 (the prime preceding 13) gives the smallest composite Mersenne number, with one of it's factors being 89. If you remove every other digit, you get 89 as well. [Meiburg]
Submitted: 20090703 17:07:36; Last Modified: 20090703 18:51:04.
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