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 A004640 #16 May 22 2024 15:17:32 %S A004640 1,8,25,59,104,187,292,426,603 %N A004640 Cubes written in base 11. (Next term contains a non-decimal character.) %H A004640 Jianing Song, <a href="/A004640/a004640.txt">Table of n, a(n) for n = 1..1000</a> (using A to represent 10) %o A004640 (PARI) a(n) = my(d=digits(n^3, 11)); my(s="", x); for(i=1, #d, if(d[i]<10, x = d[i], x = "A"); s = concat(s, x)); s \\ _Jianing Song_, May 22 2024, after _Michel Marcus_'s program for A004684 %Y A004640 Cf. A000578, A004632-A004639 (cubes written in base 2-9). %K A004640 nonn,base %O A004640 1,2 %A A004640 _N. J. A. Sloane_