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A097406 Largest primitive prime factor of 2^n-1. +0
3
0, 3, 7, 5, 31, 0, 127, 17, 73, 11, 89, 13, 8191, 43, 151, 257, 131071, 19, 524287, 41, 337, 683, 178481, 241, 1801, 2731, 262657, 113, 2089, 331, 2147483647, 65537, 599479, 43691, 122921, 109, 616318177, 174763, 121369, 61681, 164511353, 5419 (list; graph; listen)
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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