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 A019345 #14 Mar 31 2014 04:08:40 %S A019345 5,11,29,37,43,53,59,61,67,83,101,107,109,139,149,157,163,173,179,181, %T A019345 197,227,251,269,277,283,293,317,347,349,379,389,397,419,421,461,467, %U A019345 491,509,523,541,547,557,563,571,587,613,619,653,659,661,677,683,691,701,733 %N A019345 Primes with primitive root 18. %H A019345 Vincenzo Librandi, <a href="/A019345/b019345.txt">Table of n, a(n) for n = 1..1000</a> %H A019345 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a> %t A019345 pr=18; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &] %K A019345 nonn %O A019345 1,1 %A A019345 _David W. Wilson_