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 A214287 #18 Jul 17 2012 02:34:08
%S A214287 3,5,3,5,3,3,11,5,7,7,5,17,7,11,7,19,11,17,11,7,29,19,23,11,17,23,11,
%T A214287 41,19,23,41,19,31,23,17,23,59,29,31,47,19,31,43,23,23,71,59,23,31,53,
%U A214287 23,41,23,71,43,59,71,31,41,59,31,101,47,47,107,71,47,71,31,109,59,79,59,83
%N A214287 Primes of the form phi(n)-1 sorted by increasing n, where phi is the Euler totient function.
%C A214287 Primes in A109606.
%H A214287 Vincenzo Librandi, <a href="/A214287/b214287.txt">Table of n, a(n) for n = 1..1000</a>
%t A214287 Select[Table[EulerPhi[n]-1,{n,1,1000}],PrimeQ]
%Y A214287 Cf. A000010, A078892 (associated n), A214288.
%K A214287 nonn,easy
%O A214287 1,1
%A A214287 _Vincenzo Librandi_, Jul 13 2012