OFFSET
1,3
FORMULA
a(n) = n * A192508(n). - Joerg Arndt, Jul 03 2011
PROG
(Sage)
def a(n):
ans = 0
for x in GF(5^n):
if x!=0 and x.trace()==0 and x.multiplicative_order()==5^n-1: ans += 1
return ans # Robin Visser, May 10 2024
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Pasha Zusmanovich, Jun 25 2011
EXTENSIONS
a(9)-a(11) from Joerg Arndt, Oct 03 2012
a(12)-a(15) from Robin Visser, May 10 2024
STATUS
approved