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 A006716 M3369 #33 Mar 25 2025 15:31:04
%S A006716 1,4,9,49,144,441,1444,11449,44944,991494144,4914991449,149991994944,
%T A006716 9141411499911441,199499144494999441,9914419419914449449,
%U A006716 444411911999914911441,419994999149149944149149944191494441
%N A006716 Squares with digits 1, 4, 9.
%C A006716 This is probably a finite sequence, but that is only a conjecture.
%C A006716 Since 1, 4 and 9 are squares, all terms are in A053059. - _Rabii Younès_, Mar 17 2025
%D A006716 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%D A006716 I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood City, CA, 1991, p. 234.
%H A006716 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 A006716 A. Ottens, <a href="http://einstein.et.tudelft.nl/~arlet/puzzles/sol.cgi/arithmetic/digits/squares/three.digits">The arithmetic-digits-squares-three.digits problem</a>
%H A006716 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a>
%F A006716 a(n) = A027675(n)^2. - _M. F. Hasler_, Nov 15 2017
%Y A006716 Subsequence of A019544 and A053059.
%Y A006716 Cf. A027675 (square roots), A061269.
%Y A006716 For other digit groups {0,1,2} through {7,8,9}, see also: A058411, ..., A058472, A058473, A058474.
%K A006716 nonn,base
%O A006716 1,2
%A A006716 _N. J. A. Sloane_, revised Jul 10 2015
%E A006716 a(13) corrected by Neven Juric (neven.juric(AT)apis-it.hr), May 14 2003