OFFSET
1,2
COMMENTS
If n is prime, a(n) = 2 since a(p) = (tau(p^4)+3)/4 = (5+3)/4 = 2. - Wesley Ivan Hurt, Nov 16 2013
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = (A000005(n^4) + 3)/4.
MAPLE
MATHEMATICA
Table[(DivisorSigma[0, n^4] + 3)/4, {n, 100}] (* Wesley Ivan Hurt, Nov 16 2013 *)
PROG
(PARI)
A015996(n) = (numdiv(n^4)+3)/4;
for(n=1, 10000, write("b015996.txt", n, " ", A015996(n)));
\\ Antti Karttunen, Jan 17 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Definition corrected by Vladeta Jovovic, Sep 03 2005
STATUS
approved