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 A083786 #20 Oct 30 2017 03:44:47 %S A083786 4,6,8,9,0,2,4,5,6,8,0,1,2,4,5,6,7,8,0,2,3,4,5,6,8,9,0,2,4,5,6,8,9,0, %T A083786 1,2,4,5,6,7,8,0,2,3,4,5,6,8,9,0,2,4,5,6,7,8,0,1,2,4,5,6,7,8,0,1,2,3, %U A083786 4,5,6,8,9,0,2,4,5,6,8,0,1,2,4,5,6,7,8,9,0,1,2,3,4,5,6,8,9,0,2,3,4,5,6,8,0 %N A083786 Composite numbers mod 10. %H A083786 G. C. Greubel, <a href="/A083786/b083786.txt">Table of n, a(n) for n = 1..5000</a> %F A083786 a(n) = A002808(n) mod 10. - _Ray Chandler_, Sep 04 2003 %t A083786 Mod[Rest@ Select[Range@140, !PrimeQ@# &], 10] (* _Robert G. Wilson v_, Mar 17 2006 *) %o A083786 (PARI) lista(nn) = forcomposite(n=2, nn, print1(n % 10, ", ")); \\ _Michel Marcus_, Oct 30 2017 %Y A083786 Cf. A002808, A007652. %K A083786 nonn,easy %O A083786 1,1 %A A083786 _Roger L. Bagula_, Aug 21 2003 %E A083786 More terms from _Ray Chandler_, Sep 04 2003 %E A083786 Entries checked by _Robert G. Wilson v_, Mar 17 2006