A168249 n-th single or isolated number minus n-th squarefree number.

1, 2, 3, 7, 12, 16, 20, 26, 29, 33, 38, 43, 48, 51, 57, 60, 63, 68, 72, 77, 80, 93, 96, 101, 112, 118, 122, 125, 130, 134, 145, 147, 158, 168, 171, 175, 181, 190, 195, 198, 204, 210, 213, 223, 236, 239, 243, 254, 259, 269, 271, 276, 282, 287, 292, 294, 298, 304

Offset

1,2

Links

Table of n, a(n) for n=1..58.

Formula

a(n)=A167706(n)-A005117(n).

Crossrefs

Sequence in context: A259226 A330593 A275374 * A080140 A019568 A128458

Adjacent sequences: A168246 A168247 A168248 * A168250 A168251 A168252

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 21 2009

Extensions

All numbers beyond a(18) corrected by R. J. Mathar, Jun 04 2010

Status

approved