A260352 Numbers n such that both 2*n^2+11 and 2*(n+1)^2+11 are prime.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 18, 19, 23, 28, 29, 30, 41, 42, 49, 62, 69, 70, 94, 95, 108, 123, 136, 145, 151, 152, 189, 190, 204, 212, 215, 223, 227, 276, 277, 278, 281, 290, 291, 294, 314, 328, 342, 353, 367, 368, 372, 405, 410, 436, 488, 497

Offset

1,3

Comments

Both n and n+1 are terms in A092968.

Links

Zak Seidov, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[0, 600], PrimeQ[2 #^2 + 11] &&  PrimeQ[2 (# + 1)^2 + 11] &] (* Vincenzo Librandi, Jul 26 2015 *)

Prog

(PARI) isok(n) = isprime(2*n^2+11) && isprime(2*(n+1)^2+11); \\ Michel Marcus, Jul 26 2015
(Magma) [n: n in [0..600]| IsPrime( 2*n^2+11) and IsPrime(2*(n+1)^2+11)]; // Vincenzo Librandi, Jul 26 2015

Crossrefs

Cf. A092968.

Sequence in context: A328933 A032978 A197181 * A049101 A287336 A048406

Adjacent sequences: A260349 A260350 A260351 * A260353 A260354 A260355

Keyword

nonn,easy

Author

Zak Seidov, Jul 23 2015

Status

approved