A153145 Primes p such that 2*p + 19 is also prime.

2, 5, 11, 17, 41, 47, 59, 89, 107, 131, 137, 149, 167, 191, 251, 269, 311, 317, 389, 401, 419, 431, 461, 467, 479, 521, 587, 599, 641, 677, 797, 809, 839, 857, 929, 941, 947, 977, 1031, 1061, 1097, 1109, 1181, 1187, 1229, 1301, 1307, 1319, 1361, 1367, 1409

Offset

1,1

Links

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

Example

For n=2, 2*n+19 = 23 is prime, so 2 is in the sequence.

Mathematica

Select[Prime[Range[2000]], PrimeQ[2 # + 19] &] (* Vincenzo Librandi, Oct 20 2012 *)

Prog

(Magma) [p: p in PrimesUpTo(1500) | IsPrime(2*p+19)];

Crossrefs

Cf. A153143 (m and 2*m+19 are both prime), A005384 (Sophie Germain primes, m and 2*m+1 are both prime), A023204 (m and 2*m+3 are both prime), A023205 (m and 2*m+5 are both prime), A023206 (m and 2*m+7 are both prime), A023207 (m and 2*m+9 are both prime).

Sequence in context: A133928 A126204 A091936 * A174003 A144572 A038977

Adjacent sequences: A153142 A153143 A153144 * A153146 A153147 A153148

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 19 2008

Extensions

Edited, corrected and extended by Klaus Brockhaus, Dec 22 2008

Status

approved