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A153800 Indices of perfect numbers (A000396) in the sequence of multiply-perfect numbers (A007691). 5
2, 3, 5, 7, 13, 19, 25, 41, 110, 192, 229, 294 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

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.

Sequence in context: A233043 A231099 A062252 * A147791 A169647 A072467

Adjacent sequences:  A153797 A153798 A153799 * A153801 A153802 A153803

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jan 13 2009

STATUS

approved

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Last modified October 16 12:00 EDT 2018. Contains 316263 sequences. (Running on oeis4.)