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

Author

Labos Elemer

Keywords

• nonn
• easy

Examples

			11 and 11+128 = 139 are both prime.
		

Links

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

Crossrefs

Cf. A001359, A023200, A023202.

Programs

Magma

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

Mathematica

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