A174369 Numbers k such that 12k-5, 12k+1, and 12k+7 are prime.

1, 3, 6, 13, 23, 31, 51, 61, 108, 121, 146, 156, 166, 178, 198, 223, 226, 233, 276, 303, 311, 376, 383, 388, 416, 426, 451, 453, 471, 506, 531, 601, 656, 726, 783, 888, 958, 986, 1081, 1098, 1213, 1266, 1276, 1311, 1326, 1518, 1536, 1601, 1623, 1696, 1791

Offset

1,2

Links

Table of n, a(n) for n=1..51.

Example

a(1)=1 because 1*12-5=7, 1*12+1=13, and 1*12+7=19 are all prime.

Prog

(Magma) [n: n in [1..1000]|IsPrime(12*n-5) and IsPrime(12*n+1) and IsPrime(12*n+7)] // Vincenzo Librandi, Dec 06 2010

Crossrefs

Sequence in context: A239987 A048134 A058397 * A308747 A022811 A295730

Adjacent sequences: A174366 A174367 A174368 * A174370 A174371 A174372

Keyword

nonn,easy

Author

Juri-Stepan Gerasimov, Mar 17 2010

Extensions

Corrected by Charles R Greathouse IV, Mar 18 2010

a(18)-a(51) from Vincenzo Librandi, Mar 20 2010

Status

approved