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A032456
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Numbers k such that 159*2^k + 1 is prime.
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1
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6, 7, 9, 18, 19, 22, 30, 34, 42, 106, 190, 262, 339, 354, 379, 478, 523, 690, 718, 855, 963, 1087, 2478, 3309, 3862, 4155, 5098, 6678, 12898, 14226, 14274, 18738, 20065, 24390, 44079, 103417, 108850, 112374, 142462, 280438, 514927, 650934, 689437, 1579426
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OFFSET
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1,1
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COMMENTS
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The subsequence of prime values starts 7, 19, 379, 523, 1087, ... - Muniru A Asiru, Apr 28 2019
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LINKS
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MAPLE
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select(k->isprime(159*2^k+1), [$0..1000]); # Muniru A Asiru, Dec 21 2018
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MATHEMATICA
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Select[Range[1000], PrimeQ[159*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)
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PROG
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(Magma) [n: n in [1..1000] | IsPrime(159*2^n+1)]; // G. C. Greubel, Apr 28 2019
(Sage) [n for n in (1..1000) if is_prime(159*2^n+1)] # G. C. Greubel, Apr 28 2019
(GAP) Filtered([1..1000], k-> IsPrime(159*2^k+1)); # G. C. Greubel, Apr 28 2019
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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(36)-a(44) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018
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STATUS
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approved
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