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

Author

Juri-Stepan Gerasimov, Nov 21 2009

Keywords

• nonn

Formula

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

Extensions

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