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 A112590 #4 Mar 31 2012 10:30:58 %S A112590 1,8,10,1,171,1,461,1,12203,1,318880,1,57725,1,6698,1 %N A112590 Lengths of the loop of the sequences "Sum of last n digits" beginning with (n-1) zeros followed by digit 9. %e A112590 a(3)=10 because the sum of last three *digits* of the sequence beginning with 0,0,9, (two zeros followed by a 9) enters in a loop whose length is 10 terms; so a(3)=10. %e A112590 a(4)=1 because "Sum of last four digits" beginning with 0,0,0,9 enters in a cycle of one term (the same term repeated). %e A112590 Computed by Michael D Beeler. %Y A112590 Cf. A112395. %K A112590 base,easy,nonn %O A112590 1,2 %A A112590 _Alexandre Wajnberg_, Dec 17 2005