A253640 Greater of twin primes of the form (k^2 + 4, k^2 + 6).

7, 31, 1231, 4231, 366031, 819031, 1155631, 1311031, 1575031, 3822031, 4389031, 4515631, 5880631, 7102231, 9333031, 9954031, 13213231, 13432231, 16120231, 19140631, 25654231, 34987231, 37393231, 38875231, 39375631, 41152231, 47955631, 52345231, 53655631, 62647231, 67486231

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[8215]^2 + 6, And @@ PrimeQ[# - {0, 2}] &] (* Amiram Eldar, Jan 05 2020 *)

Prog

(PARI) for(x=1, 9999, ispseudoprime(x^2+4)&&ispseudoprime(x^2+6)&&print1(x^2+6", "))

Crossrefs

Cf. A001097, A001359, A006512, A085553, A085554, A253639.

Sequence in context: A289729 A197301 A280038 * A191297 A134709 A139314

Adjacent sequences: A253637 A253638 A253639 * A253641 A253642 A253643

Keyword

nonn

Author

M. F. Hasler, Jan 25 2015

Status

approved