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

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

(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

Cf. A111251, A090563.

Sequence in context: A039072 A055977 A180221 * A047373 A039048 A105764

Adjacent sequences: A111289 A111290 A111291 * A111293 A111294 A111295

nonn,easy

Parthasarathy Nambi, Nov 01 2005

approved