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 A066550 #4 Oct 27 2023 19:06:22 %S A066550 2,8,9,12,17,27,27,42,63,21,29,45,49,61,52,60,75,56,88,94,83,119,98, %T A066550 139,105,131,147,158,185,182,107,91,88,90,113,118,129,135,155,166,173, %U A066550 188,189,204,191,147,124,183,176,197,208,253,251,254,240,194,199,218,243 %N A066550 Sum of digits of n-th term of A066549. %Y A066550 Cf. A033308, A066547, A066549. %K A066550 nonn,base %O A066550 1,1 %A A066550 _Amarnath Murthy_, Dec 16 2001 %E A066550 Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 01 2003