A058461 - OEIS

%I #8 Aug 11 2024 14:41:33

%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="https://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