%I #11 Aug 11 2024 14:41:33

%S 2,3,7,97,212,997,3148,9997,20102,99997,999997,2001002,3074003,

%T 9999997,99999997,200010002,999999997,9999999997,20000100002,

%U 99999999997,953671853653,999999999997,2000001000002,2118984413357,2121179131852

%N Numbers k such that k^2 contains only digits {0,4,9}, not ending with zero.

%H Zhao Hui Du, <a href="/A058443/b058443.txt">Table of n, a(n) for n = 1..54</a>

%H P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>

%H Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#049">Sporadic tridigital solutions</a>

%Y Cf. A058444.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Nov 15 2000