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Numbers k such that k^2 contains only digits {4,6,9}.
1

%I #15 Aug 11 2024 14:41:32

%S 2,3,7,8,212,264,2236,3114,3157,31614,68187,254842,80434114,263527313,

%T 3073591864,6670791907,21134016762,21610059386,97312381892,

%U 22237232291063,999997323321167445187,22236561446627600040614,9718263579193026119075264

%N Numbers k such that k^2 contains only digits {4,6,9}.

%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 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>

%Y Cf. A053961.

%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

%E a(20)-a(23) from Mishima's website, added by _Max Alekseyev_, Nov 30 2017