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

1,2

Links

Table of n, a(n) for n=1..65.

Formula

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

Maple

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

Crossrefs

Sequence in context: A009188 A138299 A050435 * A345498 A248903 A138945

Adjacent sequences: A176653 A176654 A176655 * A176657 A176658 A176659

Keyword

nonn

Author

Juri-Stepan Gerasimov, Apr 23 2010

Extensions

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

Status

approved