A176656 The positions of single (or isolated or non-twin) primes in A000040.

1, 9, 12, 15, 16, 19, 22, 23, 24, 25, 30, 31, 32, 37, 38, 39, 40, 47, 48, 51, 54, 55, 56, 59, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 85, 86, 87, 88, 91, 92, 93, 94, 95, 96, 97, 100, 101, 102, 103, 106, 107, 108, 111, 112, 115, 118, 119, 122, 123, 124

Offset: 1

Author

Juri-Stepan Gerasimov, Apr 23 2010

Keywords

• nonn

Programs

Maple

A176656 := proc(n) numtheory[pi](A007510(n)) ; end proc: seq(A176656(n),n=1..120) ; # R. J. Mathar, Apr 26 2010

Formula

A000040(a(n))=A007510(k).

Extensions

Corrected (32 inserted, one of the 94 removed, 103 inserted, 121 replaced by 122) by R. J. Mathar, Apr 26 2010