A168241 n-th squarefree number plus n-th non-single or nonisolated number.

1, 3, 6, 10, 13, 15, 19, 21, 24, 27, 29, 32, 35, 38, 41, 43, 47, 51, 54, 56, 59, 61, 63, 66, 69, 71, 74, 76, 78, 82, 85, 90, 93, 96, 100, 102, 104, 107, 110, 114, 116, 118, 121, 124, 126, 129, 131, 135, 137, 140, 144, 146, 149, 151, 153, 157, 160, 163, 165, 168, 171

Offset

1,2

Links

Table of n, a(n) for n=1..61.

Formula

a(n)=A005117(n)+A167707(n).

Crossrefs

Sequence in context: A310047 A310048 A310049 * A099822 A117549 A190767

Adjacent sequences: A168238 A168239 A168240 * A168242 A168243 A168244

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 21 2009

Status

approved