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 A053906 #10 Aug 11 2024 14:41:32
%S A053906 1,4,26,131,276,881,3431,81346,81619,129119,132954,1292931424
%N A053906 Numbers k such that k^2 contains only digits {1,6,7}.
%H A053906 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%Y A053906 Cf. A053907.
%K A053906 nonn,base,more
%O A053906 1,2
%A A053906 _Patrick De Geest_, Mar 15 2000
%E A053906 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005