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A091514
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Primes of the form (2^n + 1)^2 - 2 = 4^n + 2^(n+1) - 1.
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10
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2, 7, 23, 79, 1087, 66047, 263167, 16785407, 1073807359, 17180131327, 68720001023, 4398050705407, 70368760954879, 18014398777917439, 18446744082299486207, 5070602400912922109586440191999
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OFFSET
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1,1
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COMMENTS
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Cletus Emmanuel calls these "Kynea primes".
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LINKS
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FORMULA
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MAPLE
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select(isprime, [seq((2^n+1)^2-2, n=0..1000)]); # Robert Israel, Feb 10 2016
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MATHEMATICA
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Select[Table[(2^n + 1)^2 - 2, {n, 0, 50}], PrimeQ] (* Eric W. Weisstein, Feb 10 2016 *)
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PROG
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(Magma) [a: n in [0..60] | IsPrime(a) where a is 4^n+2^(n+1)-1]; // Vincenzo Librandi, Dec 13 2011
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CROSSREFS
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Cf. A093069 (numbers of the form (2^n + 1)^2 - 2).
Cf. A091513 (indices n such that (2^n + 1)^2 - 2 is prime).
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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