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A032480
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Numbers k such that 207*2^k + 1 is prime.
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1
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2, 3, 4, 6, 7, 10, 14, 15, 16, 34, 42, 44, 46, 62, 66, 106, 127, 130, 171, 202, 231, 232, 238, 248, 256, 296, 314, 412, 604, 956, 1023, 1287, 1454, 1564, 1766, 2036, 5215, 5911, 6092, 9190, 9916, 10410, 13456, 14336, 14444, 15490, 30835, 32558, 34770, 41218
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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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Select[Range[1000], PrimeQ[207*2^# + 1] & ] (* Robert Price, Dec 19 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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a(50)-a(66) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 19 2018
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STATUS
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approved
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