A115554 Numbers k such that k^2 is the concatenation of two numbers m and 9*m.

14287, 28574, 15384615384615386, 23076923076923079, 30769230769230772, 14285714285714285714285714285714285714285714287, 28571428571428571428571428571428571428571428574

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base

Examples

			14287^2 = 2041_18369.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.