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Numbers k such that k^2 contains only digits {1,2,6}.
1

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

%S 1,4,11,46,511,1619,78881,81404,81619,161761,1105046,1456404,4595881,

%T 814010204,128884685369,112366637002369,47130268582155593596,

%U 51595698572871617009432954

%N Numbers k such that k^2 contains only digits {1,2,6}.

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

%Y Cf. A053883.

%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 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005

%E a(18) from _Zhao Hui Du_, Feb 28 2024