A023350 Primes that remain prime through 5 iterations of function f(x) = 8x + 7.

25589, 220469, 225629, 286619, 783269, 1215629, 1407389, 1542029, 1642919, 2329469, 2776979, 3104159, 4082759, 4229129, 5405999, 5905619, 6548849, 6862859, 7681409, 7904669, 8623799, 8971049, 9599309, 9658469, 9725039, 11420579

Offset

1,1

Comments

Primes p such that 8*p+7, 64*p+63, 512*p+511, 4096*p+4095 and 32768*p+32767 are also primes. - Vincenzo Librandi, Aug 05 2010

Links

John Cerkan, Table of n, a(n) for n = 1..10000

Formula

a(n) == 29 (mod 30). - John Cerkan, Nov 08 2016

Prog

(Magma) [n: n in [1..19000000] | IsPrime(n) and IsPrime(8*n+7) and IsPrime(64*n+63) and IsPrime(512*n+511) and IsPrime(4096*n+4095) and IsPrime(32768*n+32767)] // Vincenzo Librandi, Aug 05 2010

Crossrefs

Subsequence of A023231, A023263, A023294, A023322, and A139487.

Sequence in context: A202646 A210093 A184027 * A163186 A232838 A180299

Adjacent sequences: A023347 A023348 A023349 * A023351 A023352 A023353

Keyword

nonn

Author

David W. Wilson

Status

approved