A172410 Numbers k such that 2k + 9 and 2k + 27 are prime.

1, 2, 5, 7, 10, 16, 17, 22, 26, 31, 35, 37, 40, 50, 52, 61, 65, 70, 77, 82, 85, 86, 92, 101, 107, 112, 115, 121, 127, 142, 152, 161, 170, 185, 187, 196, 206, 211, 215, 217, 220, 226, 241, 247, 257, 280, 295, 296, 302, 316, 317, 325, 332, 337, 341, 346, 350, 362, 365

Offset

1,2

Links

Table of n, a(n) for n=1..59.

Example

a(1)=1 because 2*1+9=11 and 2*1+27=29 are both prime.

Prog

(Magma) [n: n in [0..1000] |IsPrime(2*n+9) and IsPrime(2*n+27)] // Vincenzo Librandi, Dec 06 2010

Crossrefs

Sequence in context: A080180 A159942 A102339 * A266594 A103871 A068817

Adjacent sequences: A172407 A172408 A172409 * A172411 A172412 A172413

Keyword

nonn,easy,less

Author

Juri-Stepan Gerasimov, Feb 02 2010

Extensions

Corrected and extended by Vincenzo Librandi and Charles R Greathouse IV, Mar 24 2010

Status

approved