%I M3369 #27 Aug 11 2024 14:41:29
%S 1,4,9,49,144,441,1444,11449,44944,991494144,4914991449,149991994944,
%T 9141411499911441,199499144494999441,9914419419914449449,
%U 444411911999914911441,419994999149149944149149944191494441
%N Squares with digits 1, 4, 9.
%C This is probably a finite sequence, but that is only a conjecture.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%D I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood City, CA, 1991, p. 234.
%H 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 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 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SquareNumber.html">Square Number</a>
%F a(n) = A027675(n)^2. - _M. F. Hasler_, Nov 15 2017
%Y Subsequence of A019544.
%Y Cf. A027675 (square roots), A061269.
%Y For other digit groups {0,1,2} through {7,8,9}, see also: A058411, ..., A058472, A058473, A058474.
%K nonn,base
%O 1,2
%A _N. J. A. Sloane_, revised Jul 10 2015
%E a(13) corrected by Neven Juric (neven.juric(AT)apis-it.hr), May 14 2003