A049491 Numbers k such that k and k+128 are both prime.

3, 11, 23, 29, 53, 71, 83, 101, 113, 149, 179, 239, 251, 269, 281, 293, 311, 359, 419, 443, 449, 479, 491, 503, 563, 599, 641, 659, 683, 701, 809, 839, 863, 881, 911, 941, 1103, 1109, 1151, 1163, 1193, 1301, 1319, 1361, 1439, 1451, 1481, 1493, 1499, 1571

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Example

11 and 11+128 = 139 are both prime.

Mathematica

Select[Prime[Range[300]], PrimeQ[#+128]&] (* Harvey P. Dale, Jan 16 2011 *)

Prog

(Magma) [n: n in [0..2000] | IsPrime(n) and IsPrime(n+128)]; // Vincenzo Librandi, Feb 02 2014

Crossrefs

Cf. A001359, A023200, A023202.

Sequence in context: A289526 A289765 A141226 * A000355 A163769 A100860

Adjacent sequences: A049488 A049489 A049490 * A049492 A049493 A049494

Keyword

nonn,easy

Author

Labos Elemer

Status

approved