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 A034784 #16 Mar 02 2017 23:05:31
%S A034784 3,5,8,9,11,14,15,20,21,23,26,29,33,35,39,41,44,48,50,51,53,54,56,63,
%T A034784 65,68,69,74,75,81,83,86,89,90,95,98,99,105,111,113,114,116,119,120,
%U A034784 125,128,131,134,135,140,141,146,153,155,158,165,168,173,174,176
%N A034784 Numbers n such that A034693(n) = 2.
%H A034784 Michael De Vlieger, <a href="/A034784/b034784.txt">Table of n, a(n) for n = 1..10000</a>
%t A034784 CompositeNext[n_]:=Module[{k=n+1},While[PrimeQ[k],k++ ];k]; lst={};Do[p=n+CompositeNext[n];If[PrimeQ[p],AppendTo[lst,n]],{n,2,6!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Jun 15 2009 *)
%t A034784 Position[#, 2] &@ Table[k = 1; While[! PrimeQ[k n + 1], k++]; k, {n, 180}] // Flatten (* _Michael De Vlieger_, Mar 02 2017 *)
%Y A034784 Cf. A034693, A034694.
%K A034784 nonn
%O A034784 1,1
%A A034784 _Labos Elemer_
%E A034784 Edited by _N. J. A. Sloane_, Oct 27 2012