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A050830
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Numbers k such that 157*2^k-1 is prime.
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0
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1, 5, 33, 97, 121, 125, 305, 445, 473, 513, 1581, 3077, 3517, 6345, 8797, 15265, 16641, 32185, 32581, 43905, 77025, 84377, 202345, 230777, 234401, 473073, 802321, 869073
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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[157*2^# - 1] & ] (* Robert Price, Dec 23 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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hard,nonn,more
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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(27)-a(28) from the Wilfrid Keller link by Robert Price, Dec 23 2018
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STATUS
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approved
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