1,3

sum(k=1,n,a(k)) seems to be asymptotic to C*n^2 with 1/20 < C < 1/10.

Giovanni Resta, Table of n, a(n) for n = 1..10000

(PARI) a(n) = my(m=1, s=sigma(n!)); for (k=1, n, if ((s % k!) == 0, m = max(m, k))); m; \\ Michel Marcus, Dec 05 2019

Cf. A062569 (sigma(n!)).

Sequence in context: A060397 A014780 A216199 * A094928 A178984 A065507

Adjacent sequences: A073078 A073079 A073080 * A073082 A073083 A073084

easy,nonn

Benoit Cloitre, Aug 17 2002

approved