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 A019342 #17 May 13 2019 14:56:50
%S A019342 3,17,19,23,29,53,59,73,83,89,97,109,127,131,149,151,227,239,241,251,
%T A019342 257,263,277,283,307,313,317,353,359,373,389,419,421,431,433,467,487,
%U A019342 521,541,557,563,587,593,599,601,613,631,643,653,701,709,743,751,757,761,769,787
%N A019342 Primes with primitive root 14.
%H A019342 Vincenzo Librandi, <a href="/A019342/b019342.txt">Table of n, a(n) for n = 1..1000</a>
%H A019342 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a>
%t A019342 pr=14; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
%t A019342 Join[{3},Select[Prime[Range[200]],PrimitiveRoot[#,14]==14&]] (* _Harvey P. Dale_, May 13 2019 *)
%K A019342 nonn
%O A019342 1,1
%A A019342 _David W. Wilson_