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 A019355 #18 Jan 31 2018 12:35:10 %S A019355 2,3,11,17,19,41,43,47,73,79,89,97,101,113,127,131,137,163,191,211, %T A019355 229,251,263,269,293,307,311,317,331,337,359,389,409,433,443,449,461, %U A019355 467,479,491,503,563,569,599,601,607,653,659,677,739,743,751,769,773,797,809,827 %N A019355 Primes with primitive root 29. %H A019355 Vincenzo Librandi, <a href="/A019355/b019355.txt">Table of n, a(n) for n = 1..1000</a> %H A019355 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a> %t A019355 Select[Prime[Range[200]], MultiplicativeOrder[29, #] == # - 1 &] %K A019355 nonn,easy %O A019355 1,1 %A A019355 _David W. Wilson_