A143711 (1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13, 2*7, 3*5,..) becomes (1*2*3, 2*2*5, 2*3*7, 2*3*3, 2*2*5, 11*2*2, 3*13*2, 7*3*5,..).

6, 20, 42, 18, 20, 44, 78, 105, 136, 12, 76, 105, 506, 18, 20, 117, 28, 174, 310, 165, 170, 28, 222, 114, 78, 410, 903, 44, 30, 2162, 24, 28, 30, 68, 1378, 45, 66, 399, 3422, 12, 610, 186, 84, 130, 2211, 68, 138, 2485, 18, 292, 555, 8, 1463, 78, 632, 60, 6806, 12

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 13 2008

Keywords

• nonn

Examples

			a(8)=7*3*5=105.
a(9)=2*4*17=136.
a(10)=2*3*2=12.
a(11)=19*2*2=76.
a(12)=5*3*7=105.
a(13)=2*11*23=506,
etc.
		

Crossrefs

Cf. A141287, A141261, A136735.

Extensions

a(43) corrected by R. J. Mathar, Apr 14 2010