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 A053896 #24 Aug 11 2024 14:41:32
%S A053896 1,2,12,21,38,10729,39388,664388,10743112,6415259271,10701193462,
%T A053896 2261662119229,73560479506012
%N A053896 Numbers k such that k^2 contains only digits {1,4,5}.
%H A053896 Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a>(<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>) [Broken link]
%H A053896 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%t A053896 Select[Range[1, 100000], ContainsOnly[IntegerDigits[#^2], {1, 4, 5}] &] (* _Julien Kluge_, Jul 08 2016 *)
%Y A053896 Cf. A053897.
%K A053896 nonn,base,more
%O A053896 1,2
%A A053896 _Patrick De Geest_, Mar 15 2000
%E A053896 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
%E A053896 Two more terms from _Jon E. Schoenfield_, Sep 03 2006