OFFSET
1,3
COMMENTS
a(1) = 1 by convention.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000
EXAMPLE
PROG
(PARI) A286628(n) = if(1==n, n, valuation(sigma(n), numdiv(n)));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 30 2017
STATUS
approved