A053910 - OEIS

%I #18 Mar 09 2024 18:34:16

%S 1,3,4,13,14,31,263,264,3114,4119,24737,81619,834386,1382737,9959514,

%T 10775719,341608987,836460469,998053937,24737858031,40201507014,

%U 99599046013,2488372283063,8361615872313

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

%H Zhao Hui Du, <a href="/A053910/b053910.txt">Table of n, a(n) for n = 1..31</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 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>

%Y Cf. A053911.

%K nonn,base

%O 1,2

%A _Patrick De Geest_, Mar 15 2000

%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005

%E Two more terms from _Jon E. Schoenfield_, Sep 03 2006