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 A138630 #8 Feb 12 2020 02:33:45
%S A138630 0,2,6,12,18,20,26,36,38,48,50,62,66,68,72,80,92,102,110,116,122,132,
%T A138630 150,152,156,158,170,176,180,186,188,192,198,200,230,236,270,278,282,
%U A138630 288,290,296,300,306,318,332,342,348,366,368,386,390,402,410,416,428,432,440,446
%N A138630 Nonnegative integers k such that 17*k+7 is prime.
%H A138630 Daniel Starodubtsev, <a href="/A138630/b138630.txt">Table of n, a(n) for n = 1..10000</a>
%e A138630 17*0+7=7, 17*2+7=41, 17*6+7=109, 17*18+7=211, ...
%t A138630 a={};Do[x=17*n+7;If[PrimeQ[x],AppendTo[a,n]],{n,10^2}];a
%K A138630 nonn
%O A138630 1,2
%A A138630 _Vladimir Joseph Stephan Orlovsky_, May 14 2008
%E A138630 Extended by _N. J. A. Sloane_, Jan 15 2009