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A054377
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Primary pseudoperfect numbers.
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7
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OFFSET
| 1,1
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COMMENTS
| Primary pseudoperfect numbers are the solution of the differential equation n'=n-1, being n' the arithmetic derivative of n. [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 16 2009]
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REFERENCES
| 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
| J. Sondow and K. MacMillan, Reducing the Erdos-Moser equation 1^n + 2^n + . . . + k^n = (k+1)^n modulo k and k^2, Integers 11 (2011), #A34.
Eric Weisstein's World of Mathematics, Primary pseudoperfect number.
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CROSSREFS
| Sequence in context: A123137 A014117 A188672 * A007018 A100016 A000610
Adjacent sequences: A054374 A054375 A054376 * A054378 A054379 A054380
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KEYWORD
| nonn,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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