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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
OFFSET
1,1
LINKS
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
KEYWORD
nonn,easy
STATUS
approved