A115530 Numbers k such that k^2 is the concatenation of two numbers 2*m and m.

5714285714285714286, 8571428571428571429, 11428571428571428572, 465116279069767441860465116279070, 511627906976744186046511627906977, 558139534883720930232558139534884, 604651162790697674418604651162791

Offset: 1

Author

Giovanni Resta, Jan 25 2006

Keywords

• nonn
• base

Examples

			5714285714285714286^2 = 3265306122448979592_1632653061224489796.
		

Crossrefs

Cf. A102567, A106497, A115527 - A115556.

Extensions

Definition modified by Georg Fischer, Jul 25 2019