OFFSET
1,3
FORMULA
a(n) = n * A192511(n). - Joerg Arndt, Jul 03 2011
PROG
(Sage)
def a(n):
ans = 0
for x in GF(13^n):
if x!=0 and x.trace()==0 and x.multiplicative_order()==13^n-1: ans += 1
return ans # Robin Visser, Jun 01 2024
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Pasha Zusmanovich, Jun 25 2011
EXTENSIONS
a(6) added using the data at A192511 by Amiram Eldar, May 03 2024
a(7)-a(9) from Robin Visser, Jun 01 2024
STATUS
approved