A053951 - OEIS

%I #17 Mar 10 2024 07:41:08

%S 4,7744,47444544,47775744,57577744,4755757444,44547775545744,

%T 7557757477754457744,55744775754747577744,

%U 74474545477575775744575745574544,747554745554544455555455747745774457774554454557445577744

%N Squares composed of digits {4,5,7}.

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

%F a(n) = A053950(n)^2.

%Y Cf. A053950.

%K nonn,base,more

%O 1,1

%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 Mishima's webpage added by _Max Alekseyev_, Jan 28 2012

%E a(11) from _Zhao Hui Du_, Mar 10 2024