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Squares composed of digits {0,1,9}, not ending with zero.
9

%I #11 Aug 11 2024 14:41:33

%S 1,9,1909190001999001011109190090109911991001,

%T 10199000091990191001091091099001091999900190199000001

%N Squares composed of digits {0,1,9}, not ending with zero.

%H P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>

%H Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#019">Sporadic tridigital solutions</a>

%Y Cf. A058473.

%K nonn,base,hard,more

%O 1,2

%A _Patrick De Geest_, Nov 15 2000

%E a(4) from _Zhao Hui Du_, Feb 29 2024