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A023207 Numbers m such that m and 2*m + 9 both prime. 8
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 17 16:57 EDT 2019. Contains 327136 sequences. (Running on oeis4.)