A023234 Primes p such that 9*p + 4 is also prime.

3, 7, 11, 17, 23, 31, 37, 41, 67, 71, 73, 83, 97, 107, 113, 137, 163, 191, 193, 197, 223, 263, 283, 307, 311, 317, 337, 353, 367, 373, 401, 421, 461, 491, 577, 601, 613, 617, 631, 643, 647, 653, 661, 683, 727, 743, 751, 773, 797, 821, 823, 853, 857, 881, 883, 907, 947

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..2000

Mathematica

Select[Prime[Range[1000]], PrimeQ[9 # + 4]&] (* Vincenzo Librandi, Feb 02 2014 *)

Prog

(Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(9*n+4)]; // Vincenzo Librandi, Nov 20 2010

Crossrefs

Sequence in context: A081515 A289750 A184856 * A237662 A134707 A047838

Adjacent sequences: A023231 A023232 A023233 * A023235 A023236 A023237

Keyword

nonn,easy

Author

David W. Wilson

Status

approved