A155702 Primes of the form 2n^2-9.

23, 41, 89, 191, 233, 383, 503, 569, 1049, 1559, 1913, 2039, 2441, 2729, 2879, 3191, 3863, 4409, 4793, 5399, 6263, 6719, 7433, 8969, 9239, 9791, 12473, 12791, 14783, 16553, 18041, 19991, 20393, 23753, 26903, 29759, 33791, 34313, 37529, 39191, 46199

Offset

1,1

Comments

Equivalently, primes of the form 2n^2+16n+23.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Mathematica

Select[Table[2n^2-9, {n, 2, 800}], PrimeQ]

Prog

(Magma) [a: n in [2..300] | IsPrime(a) where a is 2*n^2-9];

Crossrefs

Cf. A155703, A153037.

Sequence in context: A083444 A153037 A106970 * A114379 A345099 A106969

Adjacent sequences: A155699 A155700 A155701 * A155703 A155704 A155705

Keyword

nonn,easy

Author

Vincenzo Librandi, Jan 25 2009

Extensions

Definition rewritten by Bruno Berselli, Dec 04 2011

Status

approved