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Search: id:A116046
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A116046 n+phi(n)+phi(phi(n)) is a semiprime (A001358). +0
2
2, 3, 6, 7, 8, 11, 14, 18, 23, 27, 29, 31, 34, 37, 38, 42, 45, 47, 53, 55, 59, 63, 65, 66, 69, 73, 74, 83, 89, 90, 91, 93, 103, 105, 107, 109, 110, 117, 119, 123, 125, 127, 129, 130, 131, 138, 139, 143, 145, 150, 151, 157, 167, 174, 175, 179, 182, 183, 185, 186 (list; graph; listen)
OFFSET

1,1

EXAMPLE

103+phi(103)+phi(phi(103)) = 3*79.

CROSSREFS

Cf. A001358, A116045.

Sequence in context: A001422 A097757 A098740 this_sequence A069579 A065193 A116047

Adjacent sequences: A116043 A116044 A116045 this_sequence A116047 A116048 A116049

KEYWORD

nonn

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.


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