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 A013608 #3 May 16 2003 03:00:00 %S A013608 2,2,6,2,20,6,2,2,6,8,44,2,36,32,2,24,36,50,92,18,6,32,86,60,6,50,12, %T A013608 2,186,18,2,72,6,12,60,12,260,116,86,24,96,102,66,44,18,86,110,48,6,8, %U A013608 72,212,138,6,104,138,90,270,114,152,30,150,50,150,66,170 %N A013608 7^n-prevprime(7^n). %p A013608 seq(7^i-prevprime(7^i),i=1..100); %K A013608 nonn %O A013608 1,1 %A A013608 James Kilfiger (mapdn(AT)csv.warwick.ac.uk)