A115543 Numbers k such that the concatenation of k with 6*k gives a square.

1, 20408163265306122448979591836734694, 81632653061224489795918367346938776, 20408163265306122448979591836734693877551020408163265306122448979591836734694

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base
• less

Examples

			1_6 = 4^2.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.