A153800 Indices of perfect numbers (A000396) in the sequence of multiply-perfect numbers (A007691).

2, 3, 5, 7, 13, 19, 25, 41, 110, 192, 229, 294

Offset: 1

Author

Omar E. Pol, Jan 13 2009

Keywords

• more
• nonn

Comments

The sequence contains no further entries between 294 and 1600. - R. J. Mathar, May 26 2011

Examples

			a(7) is 25 because the 25th multiply-perfect number A007691(25)=137438691328 is also the 7th perfect number A000396(7).
		

Crossrefs

Cf. A000396, A007691.