A167886 n-th single or isolated number minus n-th non-single or nonisolated number.

2, 3, 3, 7, 11, 15, 21, 27, 31, 34, 39, 45, 51, 55, 60, 63, 68, 75, 78, 83, 87, 100, 103, 109, 119, 125, 130, 133, 138, 144, 154, 159, 171, 182, 185, 189, 195, 205, 209, 214, 220, 226, 230, 239, 252, 256, 260, 273, 278, 287, 291, 296, 303, 308, 313, 315, 320, 327

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 14 2009

Keywords

• nonn

Examples

			a(1)=2-0=2, a(2)=4-1=3, a(3)=6-3=3, a(4)=12-5=7.
		

Crossrefs

Cf. A167706, A167707.

Formula

a(n)=A167706(n)-A167707(n).

Extensions

All numbers > 68 corrected by R. J. Mathar, May 30 2010