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 A053961 Squares composed of digits {4,6,9}. 2

%I

%S 4,9,49,64,44944,69696,4999696,9696996,9966649,999444996,4649466969,

%T 64944444964,6469646694964996,69446644696999969,9446966946446994496,

%U 44499464666496696649,446646664496496964644,466994666666446696996,494494499966694999949669969

%N Squares composed of digits {4,6,9}.

%H P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>

%H Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a> (<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>)

%H Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#469">Sporadic tridigital solutions</a>

%F a(n) = A053960(n)^2.

%t fQ[n_] := Union[ Join[{4, 6, 9}, IntegerDigits[n]]] == {4, 6, 9}; lst = {}; Do[ If[ fQ[n^2], AppendTo[lst, n^2]], {n, 2*10^9}]; lst (* _Robert G. Wilson v_, Jun 01 2005 *)

%Y Cf. A053960, A107665, A107666.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Mar 15 2000

%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005

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Last modified May 31 00:06 EDT 2020. Contains 334747 sequences. (Running on oeis4.)