A168252 Numbers n such that n is squarefree and n is non-single or nonisolated.

1, 3, 5, 7, 10, 11, 13, 14, 15, 17, 19, 21, 22, 26, 29, 31, 33, 34, 35, 38, 39, 41, 43, 46, 51, 55, 57, 58, 59, 61, 62, 65, 66, 69, 70, 71, 73, 74, 77, 78, 82, 85, 86, 87, 91, 93, 94, 95, 101, 103, 105, 106, 107, 109, 110, 111, 114, 115, 118, 119, 122, 123, 129, 130, 133

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 21 2009

Keywords

• nonn

Crossrefs

Cf. A000469 (nonprime squarefree numbers), A005117 (squarefree numbers), A120944 (composite squarefree numbers), A167707 (non-single or nonisolated numbers).

Formula

A005117 INTERSECT A167707. [From R. J. Mathar, Apr 24 2010]

Extensions

Edited by N. J. A. Sloane, Jan 23 2010

Corrected (114 inserted) by R. J. Mathar, Apr 24 2010