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A063769
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Aspiring numbers: numbers whose aliquot sequence terminates in a perfect number.
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13
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25, 95, 119, 143, 417, 445, 565, 608, 650, 652, 675, 685
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| There are many numbers whose aliquot sequences have not yet been completely computed, so this sequence is not fully known. In particular, 276 may, perhaps, be an element of this sequence, although this is very unlikely.
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REFERENCES
| No number terminates at 28, the second perfect number.
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LINKS
| Eric Weisstein's World of Mathematics, Aspiring Number [From Eric W. Weisstein (eric(AT)weisstein.com), Mar 14 2009]
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EXAMPLE
| The divisors of 95 less than itself are 1, 5 and 19. They sum to 25. The divisors of 25 less than itself are 1 and 5. They sum to 6, which is perfect.
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CROSSREFS
| Sequence in context: A044593 A090659 A010013 * A099771 A158547 A144854
Adjacent sequences: A063766 A063767 A063768 * A063770 A063771 A063772
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KEYWORD
| hard,nice,nonn
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AUTHOR
| Tanya Khovanova and Alexey Radul (tanyakh(AT)yahoo.com), Aug 14 2001
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