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Search: id:A069146
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| A069146 |
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Numbers n such that n = sigma(abs(k)) - 3k, where k = sigma(n) - 3n. |
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+0
2
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| 1248, 1596, 28272, 30240, 32760, 463296, 2178540, 12865770, 23569920, 30998250, 45532800
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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There are no more terms less than 50 million.
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EXAMPLE
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Let n = 1248. The sum of the divisors of n is 3528, so k = 3528 - 3*1248 = -216. The sum of the divisors of 216 is 600, and 600 - 3*(-216) = 1248, so 1248 is in the sequence.
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CROSSREFS
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Cf. A000203, A069085, A001065.
Adjacent sequences: A069143 A069144 A069145 this_sequence A069147 A069148 A069149
Sequence in context: A023065 A066696 A114528 this_sequence A047629 A020384 A086709
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Apr 08 2002
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Apr 15 2003
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