A023207 Numbers m such that m and 2*m + 9 both prime.

2, 5, 7, 11, 17, 19, 29, 31, 37, 47, 59, 61, 71, 79, 101, 107, 109, 127, 131, 137, 149, 151, 179, 211, 227, 229, 239, 241, 257, 269, 277, 281, 311, 317, 337, 359, 367, 389, 401, 409, 439, 449, 479, 487, 491, 521, 541, 547, 557, 571, 577, 607, 641, 647, 659, 709, 719, 739

Offset

1,1

Links

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

Mathematica

Select[Prime@Range@250, PrimeQ[2#+9]&] (* Vladimir Joseph Stephan Orlovsky, Apr 25 2011 *)

Prog

(Magma) [ n: n in PrimesUpTo(1000) | IsPrime(2*n+9) ]; // Vincenzo Librandi, Nov 20 2010

Crossrefs

Cf. A005384, A023204, A023205.

Sequence in context: A020605 A323698 A045348 * A038611 A265761 A023213

Adjacent sequences: A023204 A023205 A023206 * A023208 A023209 A023210

Keyword

nonn,easy

Author

David W. Wilson

Status

approved