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 A088308 #11 Oct 30 2017 03:30:54
%S A088308 2,4,6,8,9,0,2,4,5,6,8,0,1,2,4,5,6,7,8,0,2,3,4,5,6,8,9,0,2,4,5,6,8,9,
%T A088308 0,1,2,4,5,6,7,8,0,2,3,4,5,6,8,9,0,2,4,5,6,7,8,0,1,2,4,5,6,7,8,0,1,2,
%U A088308 3,4,5,6,8,9,0,2,4,5,6,8,0,1,2,4,5,6,7,8,9,0,1,2,3,4,5,6,8,9,0,2,3,4,5,6,8
%N A088308 2 followed by list of composite numbers mod 10.
%H A088308 G. C. Greubel, <a href="/A088308/b088308.txt">Table of n, a(n) for n = 1..5000</a>
%t A088308 Join[{2}, Mod[Rest@Select[Range@500, ! PrimeQ@# &], 10]] (* _G. C. Greubel_, Oct 29 2017 *)
%Y A088308 A083786 is a better version. Cf. A002808.
%K A088308 nonn
%O A088308 1,1
%A A088308 _Roger L. Bagula_, Nov 05 2003
%E A088308 Edited by _N. J. A. Sloane_, Mar 30 2006