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Search: id:A063742
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| A063742 |
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Cototients: n such that x-Phi[x]=n has at least one solution. |
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+0
2
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| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 53, 54, 55, 56, 57, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Numbers in range of A051853, the cototients. Complement of non-cototients, A005278 with respect to natural numbers A000027.
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EXAMPLE
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First missing numbers are: 10,26,34,50,52,... These missing values are collected in A005278.
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MATHEMATICA
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Union[Table[w-EulerPhi[w], {w, 1, A}] taken for sufficiently large A.
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CROSSREFS
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Cf. A000010, A005278, A051953, A083531-A083536.
Analogous to A002202.
Sequence in context: A033865 A118764 A057717 this_sequence A014089 A065039 A043095
Adjacent sequences: A063739 A063740 A063741 this_sequence A063743 A063744 A063745
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 13 2001, corrected May 20 2003
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2008 at the suggestion of R. J. Mathar
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