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%I #15 Aug 11 2015 01:35:52
%S 12,21,37,44,107,108,120,129,191,204,209,210,223,306,315,342,343,345,
%T 370,408,413,440,501,642,696,804,955,959,982,995,1002,1044,1063,1065,
%U 1070,1080,1107,1169,1200,1275,1281,1290,1301,1306,1315,1349,1385,1503,1910
%N Numbers n such that n^2 is a concatenation of 3 nonzero squares, leading zeros not allowed.
%H Zak Seidov, <a href="/A219542/b219542.txt">Table of n, a(n) for n = 1..1500</a>
%e a(1) = 12: 12^2 = 144, 1 = 1^2, 4 = 2^2, 4 = 2^2;
%e a(1500) = 3176900^2 = 100, 9, 2693610000, 100 = 10^2, 9 = 3^2, 2693610000 = 51900^2.
%Y Cf. A039686, A048375, A048646, A145848, A147608.
%K nonn,base
%O 1,1
%A _Zak Seidov_, Nov 22 2012
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