A155752 Where 2's occur in the prime differences A001223.

1, 2, 4, 6, 9, 12, 16, 19, 25, 27, 32, 34, 40, 42, 44, 48, 51, 56, 59, 63, 68, 80, 82, 88, 97, 103, 108, 112, 115, 119, 139, 141, 143, 147, 151, 170, 172, 175, 177, 181, 189, 200, 205, 208, 211, 214, 224, 229, 233, 235, 252, 255, 261, 264, 267, 276, 285, 287, 293, 295, 301

Offset: 1

Author

Paul Curtz, Jan 26 2009

Keywords

• nonn

Comments

Starts with the same numbers as A053096.

Programs

Mathematica

Flatten[Position[Differences[Prime[Range[400]]],2]]-1 (* Harvey P. Dale, Jun 21 2017 *)

Formula

A001223(1+a(n)) = 2.

a(n) = A029707(n)-1. - R. J. Mathar, Feb 23 2009

Extensions

Edited and extended by R. J. Mathar, Feb 23 2009