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 A101284 #8 Aug 18 2013 15:02:49 %S A101284 5,9,11,17,29,35,39,51,65,71,77,95,101,107,117,129,131,137,141,149, %T A101284 161,179,185,201,215,239,249,267,269,287,297,299,305,309,315,327,329, %U A101284 339,341,347,371,375,381,401,407,429,431,441,449,459,471,479 %N A101284 Numbers n such that a type-8 Gaussian normal basis exists for GF(2^n) over GF(2). %C A101284 A type-t Gaussian normal basis exists for GF(2^n) if p=n*t+1 is prime and gcd(n,(p-1)/ord(2 mod p))==1. %o A101284 (PARI) isok(n) = (isprime(p=8*n+1) && gcd(n, (p-1)/znorder(Mod(2, p))) == 1); \\ _Michel Marcus_, Aug 18 2013 %Y A101284 Cf. A136415. %K A101284 nonn %O A101284 1,1 %A A101284 _Joerg Arndt_, Apr 09 2008