A055970 Nonprime numbers k such that k | sigma_3(k) + phi(k)^3.

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

Cf. A000010, A001158, A055697.

Sequence in context: A351803 A080394 A323975 * A158225 A080913 A343339

Adjacent sequences: A055967 A055968 A055969 * A055971 A055972 A055973

Keyword

nonn

Author

Robert G. Wilson v, Jul 19 2000

Status

approved