OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A000203(5*n).
Sum_{k=1..n} a(k) = (29*Pi^2/60) * n^2 + O(n*log(n)). - Amiram Eldar, Dec 16 2022
MATHEMATICA
Table[DivisorSigma[1, 5 n], {n, 56}] (* Michael De Vlieger, Mar 01 2017 *)
PROG
(PARI) a(n) = sigma(5*n) \\ Amiram Eldar, Dec 16 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 01 2017
STATUS
approved