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 A043681 #6 Mar 14 2020 05:54:15
%S A043681 0,1,10,11,100,101,110,1000,1001,1010,1100,10000,10001,10010,10100,
%T A043681 11000,100000,100001,100010,100100,101000,110000,684917,1000000,
%U A043681 1000001,1000010,1000100,1001000,1010000,1100000,6849170,10000000,10000001,10000010,10000100,10001000
%N A043681 When cubed gives number composed just of the digits 0, 1, 2, 3.
%C A043681 684917*10^x (whose cube is 321302302131323213*10^3x) so far is the only entry not of the form 10^a + 10^b, a>b or simply 10^a.
%H A043681 Giovanni Resta, <a href="/A043681/b043681.txt">Table of n, a(n) for n = 1..187</a>
%t A043681 Do[ If[ Union[ IntegerDigits[n^3]] [[ -1]] < 4, Print[n] ], {n, 0, 10^8} ]
%Y A043681 Cf. A030175.
%K A043681 nonn,base
%O A043681 1,3
%A A043681 _Robert G. Wilson v_, Jun 23 2001
%E A043681 Offset corrected and terms a(33) and beyond added by _Giovanni Resta_, Mar 14 2020