A115445 Numbers whose square is the concatenation of two numbers k and k-7.

9, 13, 3656545, 4565636, 5434365, 6343456, 3646962589704198389, 6353037410295801612, 9101508044249652935, 7903999111431765764698711045778, 9722180929613583946516892863960

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• base
• nonn

Examples

			4023943_4023936 = 6343456^2.
		

Crossrefs

Cf. A030467, A106497, A115434, A115427, A115438, A115439, A115440, A115441, A115442, A115443, A115444, A115446, A115447.