OFFSET
1,2
COMMENTS
a(n) is the least k such that the A318060(k*n) equals n.
LINKS
Ray Chandler, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A331033(n)/n.
PROG
(PARI) a(n) = my(k=n); while (denominator(sigma(sigma(k))/k) != n, k+=n); k/n;
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Jan 09 2020
STATUS
approved