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A146542
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Numbers n such that sigma(n) is a perfect number.
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0
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5, 12, 427, 10924032, 16125952, 22017387, 24376323, 32501857, 33288097, 3757637632, 6241076643, 8522760577, 45091651584, 66563866624, 86692869921, 137421905953, 137437511683
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 727145809044307968 and 1152771972099211264 are also terms. - Donovan Johnson, Jan 20 2012
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EXAMPLE
| 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
| Cf. A066961, A081357.
Sequence in context: A096314 A195538 A047658 * A116058 A025580 A073878
Adjacent sequences: A146539 A146540 A146541 * A146543 A146544 A146545
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KEYWORD
| nonn
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AUTHOR
| Howard Berman (howard_berman(AT)hotmail.com), Oct 31 2008
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EXTENSIONS
| Two missing terms added and a(10)-a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 20 2012
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