A055699 Numbers n such that n | (sigma_5(n) - phi(n)^5).

1, 2, 12, 34, 44, 90, 168, 258, 752, 765, 954, 1343, 2795, 3336, 4114, 4200, 5964, 6354, 9118, 11070, 11504, 11904, 15800, 20368, 40070, 48950, 65670, 91800, 94240, 144284, 177120, 226772, 312675, 334822, 451350, 518469, 761780, 804272, 1092960, 1448747, 1815800

Offset

1,2

Comments

sigma_5(n) is the sum of the 5th powers of the divisors of n (A001160).

Links

Robert G. Wilson v, Table of n, a(n) for n = 1..140

Mathematica

Select[Range@ 200000, Mod[DivisorSigma[5, #] - EulerPhi[#]^5, #] == 0 &]

Crossrefs

Sequence in context: A320542 A242709 A055707 * A244378 A062094 A334838

Adjacent sequences: A055696 A055697 A055698 * A055700 A055701 A055702

Keyword

nonn

Author

Robert G. Wilson v, Jun 09 2000

Extensions

Definition and formula corrected by Robert G. Wilson v, Mar 12 2013

Status

approved