A219542 Numbers n such that n^2 is a concatenation of 3 nonzero squares, leading zeros not allowed.

12, 21, 37, 44, 107, 108, 120, 129, 191, 204, 209, 210, 223, 306, 315, 342, 343, 345, 370, 408, 413, 440, 501, 642, 696, 804, 955, 959, 982, 995, 1002, 1044, 1063, 1065, 1070, 1080, 1107, 1169, 1200, 1275, 1281, 1290, 1301, 1306, 1315, 1349, 1385, 1503, 1910

Offset: 1

Author

Zak Seidov, Nov 22 2012

Keywords

• nonn
• base

Examples

			a(1) = 12: 12^2 = 144, 1 = 1^2, 4 = 2^2, 4 = 2^2;
a(1500) = 3176900^2 = 100, 9, 2693610000, 100 = 10^2, 9 = 3^2, 2693610000 = 51900^2.
		

Links

• Zak Seidov, Table of n, a(n) for n = 1..1500

Crossrefs

Cf. A039686, A048375, A048646, A145848, A147608.