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A023263
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Primes that remain prime through 2 iterations of function f(x) = 8x + 7.
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4
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2, 5, 107, 137, 179, 197, 227, 359, 419, 617, 659, 839, 977, 1097, 1217, 1409, 1487, 1559, 1637, 2087, 2339, 2447, 2549, 2609, 2687, 2909, 2957, 3167, 3299, 3467, 3719, 4139, 4409, 4787, 4919, 4937, 5147, 5189, 5279, 5639, 6047, 6269, 7229, 7547, 7949
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OFFSET
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1,1
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COMMENTS
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Primes p such that 8*p+7 and 64*p+63 are also primes. - Vincenzo Librandi, Aug 04 2010
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LINKS
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MATHEMATICA
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Select[Prime[Range[1100]], And@@PrimeQ[NestList[8#+7&, #, 2]]&] (* Harvey P. Dale, Jul 22 2013 *)
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PROG
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(Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(8*n+7)and IsPrime(64*n+63)] // Vincenzo Librandi, Aug 04 2010
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CROSSREFS
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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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