

A063742


Cototients: n such that xPhi[x]=n has at least one solution.


4



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
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OFFSET

1,3


COMMENTS

Numbers in range of A051853, the cototients. Complement of noncototients, A005278 with respect to natural numbers A000027.


LINKS

Table of n, a(n) for n=1..73.


EXAMPLE

First missing numbers are: 10,26,34,50,52,... These missing values are collected in A005278.


MATHEMATICA

Union[Table[wEulerPhi[w], {w, 1, A}] taken for sufficiently large A.


CROSSREFS

Cf. A000010, A005278, A051953, A083531A083536.
Analogous to A002202.
Sequence in context: A226134 A057717 A183222 * A014089 A065039 A171397
Adjacent sequences: A063739 A063740 A063741 * A063743 A063744 A063745


KEYWORD

nonn


AUTHOR

Labos Elemer, Aug 13 2001, corrected May 20 2003


EXTENSIONS

Edited by N. J. A. Sloane, Nov 17 2008 at the suggestion of R. J. Mathar


STATUS

approved



