OFFSET
1,4
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10080
Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537
FORMULA
a(n) = numerator(sigma(n)/(n+1)). - Michel Marcus, Jan 07 2023
MATHEMATICA
Table[DivisorSigma[1, n]/GCD[DivisorSigma[1, n], n + 1], {n, 80}] (* Wesley Ivan Hurt, Oct 10 2021 *)
PROG
(PARI) A339965(n) = sigma(n)/(gcd(sigma(n), n+1));
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Antti Karttunen, Dec 25 2020
STATUS
approved