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 A192214 #24 Jun 02 2024 08:22:57 %S A192214 0,0,9,80,800,5076,37982,218880,1770660,12155480,94076488,447960240 %N A192214 Number of zero trace primitive elements in Galois field GF(7^n). %F A192214 a(n) = n * A192509(n). - _Joerg Arndt_, Jul 03 2011 %o A192214 (Sage) %o A192214 def a(n): %o A192214 ans = 0 %o A192214 for x in GF(7^n): %o A192214 if x!=0 and x.trace()==0 and x.multiplicative_order()==7^n-1: ans += 1 %o A192214 return ans # _Robin Visser_, Jun 01 2024 %Y A192214 Cf. A192211, A192212, A192213, A192215, A192216 for other primes. %Y A192214 Cf. A192509. %K A192214 nonn,hard,more %O A192214 1,3 %A A192214 _Pasha Zusmanovich_, Jun 25 2011 %E A192214 a(7)-a(9) added using the data at A192509 by _Amiram Eldar_, May 03 2024 %E A192214 a(10)-a(12) from _Robin Visser_, Jun 01 2024