A053884 - OEIS

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

%S 1,11,1489,4596489,4144600242739,130834904430015239

%N Numbers k such that k^2 contains only digits {1,2,7}.

%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#127">Sporadic tridigital solutions</a>

%Y Cf. A053885.

%K nonn,base,more

%O 1,2

%A _Patrick De Geest_, Mar 15 2000

%E One more term from _Jon E. Schoenfield_, Sep 03 2006

%E One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 23 2007