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A055970
Nonprime numbers k such that k | sigma_3(k) + phi(k)^3.
2
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
OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..269 (terms below 10^10)
MATHEMATICA
Do[ If[ !PrimeQ[ n ], If[ Mod[ DivisorSigma[ 3, n ]+EulerPhi[ n ]^3, n ]==0, Print[ n ] ] ], {n, 1, 500000} ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Jul 19 2000
STATUS
approved