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A032502
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Numbers k such that 251*2^k+1 is prime.
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0
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1, 11, 13, 17, 35, 77, 155, 325, 4097, 5471, 7151, 7561, 9211, 13535, 14627, 18361, 21815, 41945, 68255, 105947, 119915, 358777, 748745, 843367, 1171193, 2730917
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listen;
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text;
internal format)
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Range[1000], PrimeQ[251*2^# + 1] & ] (* Robert Price, Dec 20 2018 *)
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PROG
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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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EXTENSIONS
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a(21)-a(25) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018
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STATUS
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approved
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