OFFSET
1,3
FORMULA
a(n) = n * A192507(n). [Joerg Arndt, Oct 03 2012]
PROG
(Sage)
def a(n):
ans = 0
for x in GF(3^n):
if x!=0 and x.trace()==0 and x.multiplicative_order()==3^n-1: ans += 1
return ans # Robin Visser, Apr 26 2024
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Pasha Zusmanovich, Jun 25 2011
EXTENSIONS
a(12)-a(17) from Joerg Arndt, Oct 03 2012
a(18)-a(21) from Robin Visser, Apr 26 2024
STATUS
approved