login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055970 Numbers n such that n | sigma_3(n) + phi(n)^3 for composite n. 0
1, 195, 366, 735, 780, 810, 860, 1070, 1692, 2940, 3135, 5535, 6076, 7344, 13194, 15980, 20320, 37638, 47520, 54216, 62296, 89964, 95208, 121770, 135540, 135681, 138278, 138456, 140228, 140284, 158598, 161602, 162432, 189777, 205400, 268380 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..36.

MATHEMATICA

Do[ If[ !PrimeQ[ n ], If[ Mod[ DivisorSigma[ 3, n ]+EulerPhi[ n ]^3, n ]==0, Print[ n ] ] ], {n, 1, 500000} ]

CROSSREFS

Sequence in context: A234100 A080394 A323975 * A158225 A080913 A157239

Adjacent sequences:  A055967 A055968 A055969 * A055971 A055972 A055973

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Jul 19 2000

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 23 14:17 EDT 2019. Contains 321431 sequences. (Running on oeis4.)