A045785 Squares with initial digit '2'.

25, 225, 256, 289, 2025, 2116, 2209, 2304, 2401, 2500, 2601, 2704, 2809, 2916, 20164, 20449, 20736, 21025, 21316, 21609, 21904, 22201, 22500, 22801, 23104, 23409, 23716, 24025, 24336, 24649, 24964, 25281, 25600, 25921, 26244, 26569

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• base

Crossrefs

Cf. A045856.

Cf. A045784, A045786, A045787, A045788, A045789, A045791, A045792, A045793.

Programs

Mathematica

Flatten[Table[Range[Ceiling[Sqrt[2 10^n]],Floor[Sqrt[3 10^n]]]^2,{n,4}]](* Harvey P. Dale, Jun 15 2011 *)

Formula

a(n) = A045856(n)^2. - Michel Marcus, Sep 04 2021