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 A053944 #19 Jul 17 2025 20:13:51
%S A053944 6,256,744,1834,18806,23166,23566,256194,2357194,2523166,187979694,
%T A053944 2310098166,19121548934,25209786895834,23527926717739784
%N A053944 Numbers k such that k^2 contains only digits {3,5,6}.
%H A053944 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>.
%H A053944 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#356">Sporadic tridigital solutions</a>.
%H A053944 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>)
%Y A053944 Cf. A053945.
%K A053944 nonn,base,more
%O A053944 1,1
%A A053944 _Patrick De Geest_, Mar 15 2000
%E A053944 One more term from Ryan H. Richter (bobort(AT)bigfoot.com), Jan 25 2001, who remarks that there are no more terms less than 4000000000
%E A053944 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005
%E A053944 One more term from _Jon E. Schoenfield_, Sep 04 2006
%E A053944 a(15) from Mishima's website added by _Elmo R. Oliveira_, Jul 17 2025