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 A112549 #3 Mar 31 2012 10:30:58 %S A112549 1,8,10,12,171,13,461,26,12203,104,318880,728,57725,5804,6698,9722 %N A112549 Lengths of the loop of the sequences "Sum of last n digits" beginning with (n-1) zeros followed by digit 3. %e A112549 a(4)=12 because the sum of last four *digits* of the sequence beginning with 0,0,0,3, (three zeros followed by a 3) enters in a loop whose length is 12 terms; so a(4)=12 %e A112549 a(5)=171 because "Sum of last five digits" beginning with 0,0,0,0,3 enters in a cycle of 171 terms. %e A112549 Computed by Michael D Beeler. %Y A112549 Cf. A112395. %K A112549 base,easy,nonn %O A112549 1,2 %A A112549 _Alexandre Wajnberg_, Dec 17 2005