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 A155149 #18 Jun 28 2023 14:58:08
%S A155149 4,5,9,11,16,20,30,34,200,300,2000,3000,20000,30000,200000,300000,
%T A155149 2000000,3000000,20000000,30000000,200000000,300000000,2000000000,
%U A155149 3000000000,20000000000,30000000000
%N A155149 Numbers k such that k^4 has exactly 3 different decimal digits.
%C A155149 Are there any more terms not of the form k * 10^n for k in {2, 3}?
%o A155149 (Python)
%o A155149 A155149_list = [n for n in range(1,10**6) if len(set(str(n**4))) == 3]
%o A155149 # _Chai Wah Wu_, Sep 27 2014
%Y A155149 Cf. A155148, A155150.
%K A155149 nonn,base,more
%O A155149 1,1
%A A155149 _Dmitry Kamenetsky_, Jan 21 2009
%E A155149 Comment and more terms from _Charles R Greathouse IV_, Nov 12 2010
%E A155149 a(21)-a(22) from _Chai Wah Wu_, Sep 27 2014
%E A155149 a(23)-a(26) from _Michael S. Branicky_, Jun 28 2023