A144123 (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13,..) becomes (4, 6, 8, 9, 10^12, 14, 15*16, 18, 20^21, 22^24, 25*26, 27, 28^30*32, 33, ..).

4, 6, 8, 9, 1000000000000, 14, 240, 18, 2097152000000000000000000000, 165251092644282265779977014214656, 650, 27, 831554883865300668552224606420411230629920768, 33, 1190, 1368

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 17 2008

Keywords

• nonn

Examples

			10^12=1000000000000=a(5).
14=a(6).
15*16=240=a(7).
20^21=2097152000000000000000000000,
etc.
		

Crossrefs

Cf. A002808, A136740, A136811, A143716.

Extensions

Corrected (18 inserted) and extended by R. J. Mathar, Apr 28 2010