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 A019389 #14 Mar 31 2014 06:54:47 %S A019389 7,23,29,47,79,83,89,101,107,113,131,137,149,157,163,173,181,193,197, %T A019389 227,229,241,257,271,293,311,331,347,353,379,383,397,401,421,439,449, %U A019389 457,461,499,521,557,563,599,601,607,617,619,641,643,647,659,673,701,719,769,821 %N A019389 Primes with primitive root 66. %H A019389 Vincenzo Librandi, <a href="/A019389/b019389.txt">Table of n, a(n) for n = 1..1000</a> %H A019389 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a> %t A019389 pr=66; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &] %K A019389 nonn %O A019389 1,1 %A A019389 _David W. Wilson_