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 A055644 #3 Mar 30 2012 18:51:26 %S A055644 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,100,101,102,103, %T A055644 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,200, %U A055644 201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218 %N A055644 Integers in base 20 with each base 20 digit represented by 2 decimal digits. %Y A055644 Cf. A049872. First differs from A008554 when n=400, a(n)=10000 and A008554(n)=2000. %K A055644 base,easy,nonn %O A055644 0,3 %A A055644 _Henry Bottomley_, Jun 06 2000