A176507 Indices of products of 2 single (or isolated or non-twin) primes in the composites.

1, 31, 52, 69, 78, 101, 120, 127, 137, 149, 177, 199, 206, 248, 259, 266, 277, 339, 359, 375, 406, 416, 426, 429, 452, 479, 501, 518, 540, 551, 579, 590, 603, 613, 623, 630, 640, 655, 662, 676, 704, 726, 732, 743, 757, 775, 795, 809, 816, 829, 837, 847, 900

Offset

1,2

Links

Table of n, a(n) for n=1..53.

Formula

A002808(k)=A176312(a(n)).

Crossrefs

Sequence in context: A068779 A068473 A275628 * A163321 A182380 A141856

Adjacent sequences: A176504 A176505 A176506 * A176508 A176509 A176510

Keyword

nonn

Author

Juri-Stepan Gerasimov, Apr 19 2010

Extensions

Corrected (553 replaced by 551) by R. J. Mathar, May 02 2010

Status

approved