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!)
A068559 Numbers m such that phi(m) = tau(m)^3. 4
1, 85, 333, 436, 1542, 1875, 2907, 3285, 3488, 3796, 5196, 10280, 17532, 17776, 20080, 21250, 28305, 30368, 30555, 32708, 34748, 35308, 36860, 37060, 41544, 41568, 43068, 44004, 45162, 48468, 51930, 81324, 98304, 98688, 104856, 131070 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Subsequence of A039771. [Enrique Pérez Herrero, Aug 29 2010]

LINKS

Enrique Pérez Herrero, Table of n, a(n) for n=1..470

PROG

(PARI) isok(m) = eulerphi(m) == numdiv(m)^3; \\ Michel Marcus, Oct 18 2019

CROSSREFS

Cf. A020488, A039771, A068560, A114063. [Enrique Pérez Herrero, Aug 29 2010]

Sequence in context: A020298 A183652 A183644 * A045017 A297399 A020212

Adjacent sequences:  A068556 A068557 A068558 * A068560 A068561 A068562

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 25 2002

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 May 24 10:47 EDT 2022. Contains 354033 sequences. (Running on oeis4.)