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Search: id:A116006
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A116006 n*phi(n)*phi(phi(n)) is a triangular number. +0
1
1, 3, 42, 77, 1517, 4238484 (list; graph; listen)
OFFSET

1,2
EXAMPLE

1517*phi(1517)*phi(phi(1517))=T(40959).

CROSSREFS

Cf. A116002.

Adjacent sequences: A116003 A116004 A116005 this_sequence A116007 A116008 A116009

Sequence in context: A139161 A057013 A055755 this_sequence A079826 A112291 A063040

KEYWORD

nonn

AUTHOR

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

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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