A007637 Primes of form 3n^2-3n+23. (Formerly M5130)

23, 29, 41, 59, 83, 113, 149, 191, 239, 293, 353, 419, 491, 569, 653, 743, 839, 941, 1049, 1163, 1283, 1409, 1823, 1973, 2129, 2459, 2633, 2999, 3191, 3389, 3593, 3803, 4019, 4241, 4703, 4943, 5189, 5441, 6791, 7079, 7673, 8291, 8609

Offset

1,1

References

P. Hoffman, Archimedes' Revenge, Penguin Books 1988, pp. 39-40.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

H. Dubner, Generalized Cullen numbers, J. Rec. Math., 21 (No. 3, 1989), 190-191. (Annotated scanned copy)

Mathematica

Select[Table[3 n^2 - 3 n + 23, {n, 60}], PrimeQ] (* Vincenzo Librandi, Mar 20 2013 *)

Prog

(Magma) [a: n in [1..60] | IsPrime(a) where a is 3*n^2-3*n+23]; // Vincenzo Librandi, Mar 20 2013

Crossrefs

Sequence in context: A303009 A227757 A227756 * A161723 A085448 A095077

Adjacent sequences: A007634 A007635 A007636 * A007638 A007639 A007640

Keyword

nonn,easy

Author

N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v

Status

approved