A218977 Primes of the form 2n^2 - 181 for n >= 0.

-181, -179, -173, -163, -149, -131, -109, -83, -53, -19, 19, 61, 107, 157, 211, 269, 331, 397, 467, 541, 619, 701, 787, 877, 971, 1069, 1171, 1277, 1619, 1741, 1867, 1997, 2131, 2269, 2411, 2557, 2707, 2861, 3019, 3181, 3347, 3517, 3691, 4051, 4621, 5021

Offset

1,1

Comments

Here we allow primes to be negative.

Links

Table of n, a(n) for n=1..46.

Example

2*(40)^2 - 181 = 3019, which is prime.

Mathematica

Select[2*Range[0, 60]^2-181, PrimeQ] (* Harvey P. Dale, May 11 2018 *)

Crossrefs

Sequence in context: A036200 A357657 A253432 * A253439 A175789 A157747

Adjacent sequences: A218974 A218975 A218976 * A218978 A218979 A218980

Keyword

sign

Author

César Aguilera, Nov 13 2012

Status

approved