A167888 n-th single or isolated number^n-th non-single or nonisolated number.

1, 4, 216, 248832, 612220032, 78310985281, 19683000000000, 4808584372417849, 717368321110468608, 5460999706120583177327, 1379946262057143768386569, 470184984576000000000000000, 164890958756244164895763202881

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 14 2009

Keywords

• nonn

Examples

			a(1)=2^0=1, a(2)=4^1=4, a(3)=6^3=216, a(4)=12^5=248832.
		

Crossrefs

Cf. A167706, A167707.

Formula

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

Extensions

More terms from R. J. Mathar, May 30 2010