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%I #18 Feb 29 2024 07:08:23
%S 1,3,11,173,3161,34827,43923,44623,54123,1108661,9603239,14832161,
%T 9960980373,1513668461761,99961098929489127,459556524411439511,
%U 145303131149776986249167839
%N Numbers k such that k^2 contains only digits {1,2,9}.
%H Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a>(<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>)
%H P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#129">Squares consisting of 3 different digits</a>
%Y Cf. A053889.
%K nonn,base,more
%O 1,2
%A _Patrick De Geest_, Mar 15 2000
%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
%E One more term from _Jon E. Schoenfield_, Sep 03 2006
%E Two more terms from Mishima's webpage added by _Max Alekseyev_, Jun 17 2011
%E a(17) from _Zhao Hui Du_, Feb 29 2024
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