OFFSET
1,3
LINKS
David A. Corneth, Table of n, a(n) for n = 1..10000
MAPLE
a:= n-> (s-> s*(n*(n+1)/2-s))(numtheory[sigma](n)):
seq(a(n), n=1..45); # Alois P. Heinz, Feb 05 2021
PROG
(PARI) a(n) = my(s=sigma(n)); s*(n*(n+1)/2 - s); \\ Michel Marcus, Feb 05 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jan 23 2002
STATUS
approved