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Search: id:A146542
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| A146542 |
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Numbers such that sigma(n) is a perfect number. |
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+0
1
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OFFSET
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1,1
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COMMENT
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I may have missed some numbers where sigma(n) = 33550336.
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EXAMPLE
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The divisors of 5 are 1 and 5, which add up to 6. 6 is a perfect number because its proper divisors are 1, 2 and 3, which also add up to 6.
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CROSSREFS
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Cf. A066961, A081357
Sequence in context: A009754 A096314 A047658 this_sequence A116058 A025580 A073878
Adjacent sequences: A146539 A146540 A146541 this_sequence A146543 A146544 A146545
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KEYWORD
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nonn
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AUTHOR
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Howard Berman (howard_berman(AT)hotmail.com), Oct 31 2008
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