A108472 Numbers n such that 4*prime(n)+prime(n+1) is prime.

1, 2, 15, 16, 18, 23, 32, 36, 51, 55, 56, 58, 74, 86, 91, 96, 97, 99, 100, 102, 105, 108, 110, 111, 119, 123, 130, 133, 164, 174, 185, 187, 199, 200, 203, 208, 214, 219, 232, 239, 252, 257, 260, 263, 272, 280, 284, 291, 298, 300, 305, 311, 312, 339, 342, 356

Offset

1,2

Comments

Complement to A108473.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

ra=Range[500]; cnd=PrimeQ[4*Prime[ # ]+Prime[ #+1]]&; se=Select[ra, cnd]
Flatten[Position[Partition[Prime[Range[400]], 2, 1], _?(PrimeQ[4#[[1]]+ #[[2]]]&), {1}, Heads->False]] (* Harvey P. Dale, Apr 02 2015 *)

Crossrefs

Cf. A108473.

Sequence in context: A163480 A037312 A267711 * A039771 A032934 A370977

Adjacent sequences: A108469 A108470 A108471 * A108473 A108474 A108475

Keyword

nonn

Author

Zak Seidov, Jun 04 2005

Status

approved