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 A055645 #6 Jun 23 2014 09:44:35 %S A055645 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,100,101,102,103,104,105,106, %T A055645 107,108,109,110,111,112,113,114,115,200,201,202,203,204,205,206,207, %U A055645 208,209,210,211,212,213,214,215,300,301,302,303,304,305,306,307,308,309 %N A055645 Integers in base 16 with each hexadecimal digit represented by 2 decimal digits. %H A055645 Alois P. Heinz, <a href="/A055645/b055645.txt">Table of n, a(n) for n = 0..1000</a> %p A055645 a:= proc(n) local i, m, r ; m:=n; r:=0; %p A055645 for i from 0 while m>0 do %p A055645 r:= r +100^i*irem(m, 16, 'm') %p A055645 od; r %p A055645 end: %p A055645 seq(a(n), n=0..60); # _Alois P. Heinz_, Jun 23 2014 %Y A055645 Cf. A049872. %K A055645 base,easy,nonn %O A055645 0,3 %A A055645 _Henry Bottomley_, Jun 06 2000