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 A019359 #18 Jan 31 2018 11:41:19 %S A019359 2,5,7,13,19,23,43,47,53,59,71,73,89,113,137,179,191,251,257,269,311, %T A019359 317,337,349,353,383,389,409,419,439,443,449,457,467,509,547,571,587, %U A019359 599,601,613,617,641,647,653,683,719,733,739,773,787,797,811,839,853,863,877,911 %N A019359 Primes with primitive root 33. %H A019359 Vincenzo Librandi, <a href="/A019359/b019359.txt">Table of n, a(n) for n = 1..1000</a> %H A019359 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a> %t A019359 Select[Prime[Range[200]], MultiplicativeOrder[33, #] == # - 1 &] %K A019359 nonn,easy %O A019359 1,1 %A A019359 _David W. Wilson_