A111292 Numbers n such that 6*n^2 + 6*n + 1 is prime.

1, 2, 3, 5, 7, 8, 9, 10, 12, 13, 18, 19, 20, 22, 23, 30, 31, 32, 33, 35, 36, 38, 41, 42, 43, 45, 46, 47, 51, 55, 58, 60, 65, 67, 73, 74, 77, 78, 84, 86, 88, 93, 95, 97, 100, 101, 104, 106, 107, 109, 112, 117, 120, 123, 124, 126, 129, 130, 132, 134, 135, 137, 143, 148, 151

Offset

1,2

Links

Table of n, a(n) for n=1..65.

Example

If n=43 then 6*n^2 + 6*n + 1 = 11353 (prime).

Prog

(Magma) [n: n in [0..200] |IsPrime(6*n^2+6*n+1)]; // Vincenzo Librandi, Nov 13 2010
(PARI) is(n)=isprime(6*n^2+6*n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A111251, A090563.

Sequence in context: A039072 A055977 A180221 * A047373 A039048 A105764

Adjacent sequences: A111289 A111290 A111291 * A111293 A111294 A111295

Keyword

nonn,easy

Author

Parthasarathy Nambi, Nov 01 2005

Status

approved