This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A192216 #21 Jun 02 2024 08:22:32 %S A192216 0,0,54,448,9520,103104,1608936,13488064,267423822 %N A192216 Number of zero trace primitive elements in Galois field GF(13^n). %F A192216 a(n) = n * A192511(n). - _Joerg Arndt_, Jul 03 2011 %o A192216 (Sage) %o A192216 def a(n): %o A192216 ans = 0 %o A192216 for x in GF(13^n): %o A192216 if x!=0 and x.trace()==0 and x.multiplicative_order()==13^n-1: ans += 1 %o A192216 return ans # _Robin Visser_, Jun 01 2024 %Y A192216 Cf. A192211, A192212, A192213, A192214, A192215 for other primes. %Y A192216 Cf. A192511. %K A192216 nonn,hard,more %O A192216 1,3 %A A192216 _Pasha Zusmanovich_, Jun 25 2011 %E A192216 a(6) added using the data at A192511 by _Amiram Eldar_, May 03 2024 %E A192216 a(7)-a(9) from _Robin Visser_, Jun 01 2024