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A158036
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Integer solutions f for f = (4^n - 2^n + 8n^2 - 2) / (2n * (2n + 1)) with n an integer
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5
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3, 8287, 32547981403, 3374074914839397834392750148706282243018046503, 107547872626305931371847778721098686654377801057464206176785452350259573207, 4568366860875634575966528292411682488942909674818941246717098803707597353756388768388059303363024343431
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OFFSET
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1,1
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COMMENTS
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8287 = 129 * 64 + 31 = 257 * 32 + 63 is prime. A158034 (values of n) is often prime. A158035 (2n + 1) appears to be always prime.
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LINKS
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PROG
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(Haskell)
a158036 = (\x -> (4^x - 2^x + 8*x^2 - 2) `div` (2*x*(2*x + 1))) . a158034
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CROSSREFS
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Cf. A145918 (exponential Sophie Germain primes)
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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