A053928 - OEIS

%I #26 Aug 11 2024 14:41:32

%S 3,5,15,23,77,173,235,315,1515,2435,7227,23515,54335,97773,243515,

%T 2435077,3090673,72497765,74533585,9639636523,979793819766485,

%U 77170285247817565,9794365502654705173,1598601020441309256565,30484348812550551609088485,76975943837016723668817565

%N Numbers k such that k^2 contains only digits {2,5,9}.

%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 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 H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#259">Sporadic tridigital solutions</a>

%Y Cf. A053929.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Mar 15 2000

%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005

%E a(21)-a(24) from Mishima's page added by _Max Alekseyev_, Aug 18 2013

%E More terms from _Zhao Hui Du_, Mar 01 2024