OFFSET
1,1
LINKS
Vaclav Kotesovec, Graph - the asymptotic ratio (100000 terms)
FORMULA
Sum_{k=1..n} a(k) ~ (9*n*(log(n) + 2*gamma - 1) + n*log(5)) / 5, where gamma is the Euler-Mascheroni constant A001620.
MATHEMATICA
Table[DivisorSigma[0, 5*n], {n, 1, 150}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, May 13 2024
STATUS
approved