A053891 - OEIS

%I #19 Mar 11 2024 08:20:00

%S 1,4,144,441,1444,1411344,431434441,1441113444,11414343334144,

%T 134433311433444,4334114143334143111441,14431113411144114144433444,

%U 331413131434411141441331411344,444341333431434111311131411343131143441

%N Squares composed of digits {1,3,4}.

%H Zhao Hui Du, <a href="/A053891/b053891.txt">Table of n, a(n) for n = 1..15</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>

%H H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#134">Sporadic tridigital solutions</a>

%F a(n) = A053890(n)^2.

%Y Cf. A053890.

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

%E Two more terms from Mishima's page added by _Max Alekseyev_, Jan 28 2012