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 A053914 #17 Aug 11 2024 14:41:32
%S A053914 1,3,9,109,141,10583,34641,44510583,105741141,942926927083,
%T A053914 4346471925583,2969848344609859
%N A053914 Numbers k such that k^2 contains only digits {1,8,9}.
%H A053914 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H A053914 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>)
%H A053914 H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#189">Sporadic tridigital solutions</a>
%Y A053914 Cf. A053915.
%K A053914 nonn,base,more
%O A053914 1,2
%A A053914 _Patrick De Geest_, Mar 15 2000
%E A053914 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
%E A053914 One more term from _Jon E. Schoenfield_, Sep 03 2006
%E A053914 One more term from Mishima's webpage added by _Max Alekseyev_, Jan 28 2012