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A023263
Primes that remain prime through 2 iterations of function f(x) = 8x + 7.
4
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
OFFSET
1,1
COMMENTS
Primes p such that 8*p+7 and 64*p+63 are also primes. - Vincenzo Librandi, Aug 04 2010
LINKS
MATHEMATICA
Select[Prime[Range[1100]], And@@PrimeQ[NestList[8#+7&, #, 2]]&] (* Harvey P. Dale, Jul 22 2013 *)
PROG
(Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(8*n+7)and IsPrime(64*n+63)] // Vincenzo Librandi, Aug 04 2010
CROSSREFS
Sequence in context: A237267 A266284 A215572 * A070855 A228850 A041237
KEYWORD
nonn
STATUS
approved