A115553 Numbers k such that the concatenation of k with 9*k gives a square.

2041, 8164, 2366863905325444, 5325443786982249, 9467455621301776, 2040816326530612244897959183673469387755102041, 8163265306122448979591836734693877551020408164

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base

Examples

			2041_18369 = 14287^2.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.