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A050541
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Numbers k such that 31*2^k-1 is prime.
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0
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1, 5, 7, 11, 13, 23, 33, 35, 37, 47, 115, 205, 235, 271, 409, 739, 837, 887, 2189, 3465, 4653, 5073, 8011, 8061, 21957, 24589, 25657, 44653, 50321, 57647, 62083, 78179, 80021, 81655, 111667, 150265, 177089, 196433, 274115, 306751, 311389, 315523, 406105, 421129
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OFFSET
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1,2
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COMMENTS
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773227 is also in the sequence. - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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LINKS
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MATHEMATICA
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Select[Range[1000], PrimeQ[31*2^# - 1] & ] (* Robert Price, Dec 22 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(43)-a(44) from the Wilfrid Keller link by Robert Price, Dec 22 2018
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STATUS
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approved
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