OFFSET
1,2
COMMENTS
Equivalently, the number of solutions to x^7 + y^7 + z^7 == 0 (mod n). - Andrew Howroyd, Jul 17 2018
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..1000
PROG
(PARI) a(n)={my(p=Mod(sum(i=0, n-1, x^lift(Mod(i, n)^7)), 1-x^n)); polcoeff(lift(p^3), 0)} \\ Andrew Howroyd, Jul 17 2018
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Seiichi Manyama, Jun 05 2017
EXTENSIONS
Keyword:mult added by Andrew Howroyd, Jul 17 2018
STATUS
approved