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 A053882 #14 Aug 11 2024 14:41:32
%S A053882 1,4,11,46,511,1619,78881,81404,81619,161761,1105046,1456404,4595881,
%T A053882 814010204,128884685369,112366637002369,47130268582155593596,
%U A053882 51595698572871617009432954
%N A053882 Numbers k such that k^2 contains only digits {1,2,6}.
%H A053882 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 A053882 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Sporadic tridigital solutions</a>
%Y A053882 Cf. A053883.
%K A053882 nonn,base,more
%O A053882 1,2
%A A053882 _Patrick De Geest_, Mar 15 2000
%E A053882 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
%E A053882 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
%E A053882 a(18) from _Zhao Hui Du_, Feb 28 2024