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A337431
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Numbers k such that the largest prime factor of 2^k - 1 is greater than the largest prime factor of 2^k + 1.
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2
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3, 5, 7, 9, 13, 14, 17, 19, 26, 27, 31, 33, 34, 35, 37, 46, 49, 51, 59, 61, 62, 65, 69, 74, 77, 78, 82, 83, 86, 89, 93, 97, 103, 107, 115, 118, 121, 122, 123, 127, 129, 130, 131, 133, 137, 141, 142, 143, 144, 145, 147, 150, 153, 154, 165, 166, 169, 170, 174, 175
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OFFSET
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1,1
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LINKS
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PROG
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(PARI) for(n=2, 175, my(p=vecmax(factor(2^n-1)[, 1]), q=vecmax(factor(2^n+1)[, 1])); if(p>q, print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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