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A116006 n*phi(n)*phi(phi(n)) is a triangular number. 0
1, 3, 42, 77, 1517, 4238484 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

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

CROSSREFS

Cf. A116002.

Sequence in context: A192888 A057013 A055755 * A079826 A112291 A063040

Adjacent sequences:  A116003 A116004 A116005 * A116007 A116008 A116009

KEYWORD

nonn

AUTHOR

Giovanni Resta, Feb 13 2006

STATUS

approved

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Last modified May 20 13:49 EDT 2013. Contains 225461 sequences.