OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
Vaclav Kotesovec, Plot of a(n) / A372674(n) for n = 1..100000
FORMULA
Conjecture: a(n) ~ A372674(n) / 2. - Vaclav Kotesovec, May 13 2024
MATHEMATICA
Table[Sum[DivisorSigma[0, k*n], {k, 1, n}], {n, 1, 50}] (* Vaclav Kotesovec, May 13 2024 *)
PROG
(PARI) a(n) = sum(k=1, n, numdiv(n*k));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 11 2024
STATUS
approved