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A153800
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Indices of perfect numbers (A000396) in the sequence of multiply-perfect numbers (A007691).
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5
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2, 3, 5, 7, 13, 19, 25, 41, 110, 192, 229, 294
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The sequence contains no further entries between 294 and 1600. - R. J. Mathar, May 26 2011
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LINKS
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EXAMPLE
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a(7) is 25 because the 25th multiply-perfect number A007691(25)=137438691328 is also the 7th perfect number A000396(7).
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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STATUS
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approved
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