login
A153145
Primes p such that 2*p + 19 is also prime.
1
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
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: A372197 A126204 A091936 * A174003 A144572 A038977
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 19 2008
EXTENSIONS
Edited, corrected and extended by Klaus Brockhaus, Dec 22 2008
STATUS
approved