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 A138622 #12 Dec 21 2019 18:27:13
%S A138622 1,3,6,7,10,12,13,16,18,21,22,25,30,31,33,36,42,43,46,52,55,57,58,60,
%T A138622 61,63,67,73,75,76,78,87,88,90,93,100,102,106,108,111,112,115,117,121,
%U A138622 123,127,132,133,135,138,141,142,145,150,151,153,160,162,163
%N A138622 Nonnegative integers k such that 14*k-1 is prime.
%H A138622 Daniel Starodubtsev, <a href="/A138622/b138622.txt">Table of n, a(n) for n = 1..10000</a>
%e A138622 14*1-1=13, 14*3-1=41, 14*6-1=83, ...
%t A138622 a={};Do[x=14*n-1;If[PrimeQ[x],AppendTo[a,n]],{n,10^2}];a
%t A138622 Select[Range[200],PrimeQ[14#-1]&] (* _Harvey P. Dale_, May 01 2013 *)
%Y A138622 Cf. A045473.
%K A138622 nonn
%O A138622 1,2
%A A138622 _Vladimir Joseph Stephan Orlovsky_, May 14 2008
%E A138622 More terms from _Harvey P. Dale_, May 01 2013