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 A053907 #15 Jul 17 2025 14:49:25
%S A053907 1,16,676,17161,76176,776161,11771761,6617171716,6661661161,
%T A053907 16671716161,17676766116,1671671667166667776
%N A053907 Squares composed of digits {1,6,7}.
%H A053907 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 A053907 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#167">Sporadic tridigital solutions</a>.
%F A053907 a(n) = A053906(n)^2. - _Elmo R. Oliveira_, Jul 17 2025
%Y A053907 Cf. A053906.
%K A053907 nonn,base,more
%O A053907 1,2
%A A053907 _Patrick De Geest_, Mar 15 2000
%E A053907 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005