A089530 A023204 indexed by A000040.

1, 3, 4, 6, 7, 8, 10, 14, 15, 16, 19, 21, 24, 25, 30, 31, 33, 34, 37, 39, 40, 44, 45, 46, 48, 49, 50, 57, 59, 61, 63, 68, 70, 71, 75, 76, 78, 80, 85, 90, 91, 93, 96, 97, 99, 101, 102, 103, 109, 111, 112, 113, 117, 118, 120, 131, 132, 137, 139, 140, 144, 147, 149, 154

Offset: 1

Author

Ray Chandler, Nov 07 2003

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A023204, A089531, A089532.

Programs

Magma

[n: n in [1..250] | IsPrime(2*NthPrime(n)+3)]; // Vincenzo Librandi, May 02 2016

Mathematica

Select[Range[160], PrimeQ[2 Prime[#] + 3] &] (* Vincenzo Librandi, May 02 2016 *)

Formula

a(n)=k such that A023204(n)=A000040(k).