OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
J. Fabrykowski and M. V. Subbarao, The maximal order and the average order of multiplicative function sigma^(e)(n), in Théorie des nombres/Number theory (Quebec, PQ, 1987), 201-206, de Gruyter, Berlin, 1989.
FORMULA
a(n) ~ B * n^2, where B = 0.5682854937... (A275480).
MATHEMATICA
esigma[n_] := Times @@ (Sum[ First[#]^d, {d, Divisors[Last[#]]}] & ) /@ FactorInteger[n]; Accumulate[Array[esigma, 60]] (* after Jean-François Alcover at A051377 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Mar 21 2019
STATUS
approved