A053912 - OEIS

%I #9 Aug 11 2024 14:41:32

%S 1,9,109,280859,105769141,279067891

%N Numbers k such that k^2 contains only digits {1,7,8}.

%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>

%Y Cf. A053913.

%K nonn,base,more

%O 1,2

%A _Patrick De Geest_, Mar 15 2000