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
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Programs
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Magma
[ n: n in PrimesUpTo(1000) | IsPrime(2*n+9) ]; // Vincenzo Librandi, Nov 20 2010
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Mathematica
Select[Prime@Range@250,PrimeQ[2#+9]&] (* Vladimir Joseph Stephan Orlovsky, Apr 25 2011 *)