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Squares composed of digits {0,2,4}, not ending with zero.
2

%I #13 Oct 18 2024 14:36:12

%S 4,2244004,42224004,424442404,22200404004,4024044024004,

%T 40244204444224,2242202244202404,40024004400240004,40402004202240004,

%U 400024000440002400004,2202400402420402044004,4000024000044000024000004,40000024000004400000240000004,2440040242204024220420044444224

%N Squares composed of digits {0,2,4}, not ending with zero.

%C Includes all numbers of the form (2*100^k + 6*10^k + 2)^2 for k >= 2. - _Andrew Howroyd_, Oct 18 2024

%H Zhao Hui Du, <a href="/A058424/b058424.txt">Table of n, a(n) for n = 1..24</a>

%H Patrick De Geest, <a href="http://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#024">Sporadic tridigital solutions</a>

%F a(n) = A058423(n)^2. - _Andrew Howroyd_, Oct 18 2024

%Y Cf. A058423.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Nov 15 2000