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
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