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Search: id:A054377
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| A054377 |
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Primary pseudoperfect numbers. |
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+0
2
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| 2, 6, 42, 1806, 47058, 2214502422, 52495396602, 8490421583559688410706771261086
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Primary pseudoperfect numbers are the solution of the differential equation n'=n-1, being n' the arithmetic derivative of n. [From Paolo P. Lava (ppl(AT)spl.at), Nov 16 2009]
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REFERENCES
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Butske, W.; Jaje, L.M.; and Mayernik, D.R. "The Equation $ Sum_{p|N}{1/p+1/N}=1$, Pseudoperfect Numbers and Partially Weighted Graphs." Math. Comput., _69_, 407-420, 1999.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
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Sequence in context: A115961 A123137 A014117 this_sequence A007018 A100016 A000610
Adjacent sequences: A054374 A054375 A054376 this_sequence A054378 A054379 A054380
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KEYWORD
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nonn,more
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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