login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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: A055755 A249046 A237661 * A079826 A112291 A063040

Adjacent sequences:  A116003 A116004 A116005 * A116007 A116008 A116009

KEYWORD

nonn

AUTHOR

Giovanni Resta, Feb 13 2006

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 10 16:03 EDT 2022. Contains 356039 sequences. (Running on oeis4.)