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A282946
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Numbers k such that 5*2^k + 1 is a prime factor of a generalized Fermat number 11^(2^m) + 1 for some m.
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1
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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lst = {}; Do[p = 5*2^n + 1; If[PrimeQ[p] && IntegerQ@Log[2, MultiplicativeOrder[11, p]], AppendTo[lst, n]], {n, 1, 1947, 2}]; lst
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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