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Search: id:A092788
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| 1, 1, 1, 1, 2, 2, 1, 2, 1, 2, 2, 2
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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USUP stands for UnitarySigmaUnitaryPhi(n) or USUP(n).
Consider numbers such that USUP(n) = n/k. If n = Product p_i^r_i then USUP(n) = UnitarySigma(2^r_1)*UnitaryPhi(n/2^r_1) = (2^(r_1)+1)*Product(p_i^r_i-1), 2<p_i. Sequence gives k numbers.
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CROSSREFS
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Cf. A092760.
Sequence in context: A082389 A119469 A127439 this_sequence A091267 A003643 A058062
Adjacent sequences: A092785 A092786 A092787 this_sequence A092789 A092790 A092791
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), Apr 14 2004
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