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Numbers k such that k^2 contains only digits {5,8,9}.
2

%I #7 Aug 11 2024 14:41:33

%S 3,99927917,92496431583

%N Numbers k such that k^2 contains only digits {5,8,9}.

%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#589">Sporadic tridigital solutions</a>

%Y Cf. A058470.

%K nonn,base,hard,more,bref

%O 1,1

%A _Patrick De Geest_, Nov 15 2000