OFFSET
1,2
COMMENTS
It is not difficult to show that these numbers have the form a(n) = 3^i*4^j with j <= i <= 2j.
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..1000 (terms 1..50 from Harry J. Smith)
PROG
(PARI) ns(n)= { local(f, p=1); f=factor(n); for(i=1, matsize(f)[1], p*=(1 + f[i, 1])^f[i, 2]); return(p) } { n=0; for (m=1, 10^9, s=ns(m); if (s%m == 0, write("b064518.txt", n++, " ", s); if (n==50, break)) ) } \\ Harry J. Smith, Sep 17 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Oct 07 2001
EXTENSIONS
Title clarified by Sean A. Irvine, Jul 15 2023
STATUS
approved