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Numbers k such that k^2 contains only digits {3,4,9}.
1

%I #12 Aug 11 2024 14:41:32

%S 2,3,7,212,2107,586893,658357,185605616817891584607

%N Numbers k such that k^2 contains only digits {3,4,9}.

%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 H. Mishima <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Squares consisted of 3 different digits</a> [From _Max Alekseyev_, Mar 10 2009]

%Y Cf. A053943.

%K nonn,base,more

%O 1,1

%A _Patrick De Geest_, Mar 15 2000

%E 185605616817891584607 from Mishima's page added by _Max Alekseyev_, Mar 10 2009