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%I #7 Oct 18 2019 22:15:25
%S 26,526,1636345826,512130136076,150573163864701424
%N Numbers k such that k^2 contains only digits {2,6,7}.
%H P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#267">Sporadic tridigital solutions</a>
%Y Cf. A058462.
%K nonn,base,hard,more
%O 1,1
%A _Patrick De Geest_, Nov 15 2000
%E a(5) (from the Mishima web site) added by _Max Alekseyev_, Jan 11 2007
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