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A168249 n-th single or isolated number minus n-th squarefree number. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 18 03:03 EDT 2021. Contains 343994 sequences. (Running on oeis4.)