A115541 Numbers k such that the concatenation of 5*k with k gives a square.

1020408163265306122449, 4081632653061224489796, 9183673469387755102041, 106678449690695619239994950132559020325716449943188991289, 123721752304002019946976391869713420022724403484408534276

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base

Examples

			5102040816326530612245_1020408163265306122449 = 7142857142857142857143^2.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.