A115544 Numbers k such that k^2 is the concatenation of two numbers m and 6*m.

4, 142857142857142857142857142857142858, 285714285714285714285714285714285716, 142857142857142857142857142857142857142857142857142857142857142857142857142858

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base

Examples

			4^2 = 1_6.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.