A035072 a(n) is root of square starting with digit 5: first term of runs.

23, 71, 224, 708, 2237, 7072, 22361, 70711, 223607, 707107, 2236068, 7071068, 22360680, 70710679, 223606798, 707106782, 2236067978, 7071067812, 22360679775, 70710678119, 223606797750, 707106781187, 2236067977500

Offset: 2

Author

Patrick De Geest, Nov 15 1998

Keywords

• nonn
• base

Crossrefs

Cf. A067475 (squares), A035076 (2..9).

Programs

Mathematica

Table[Ceiling @ Sqrt[5 * 10^n], {n, 2 , 24}] (* Amiram Eldar, Oct 08 2019 *)

Formula

a(n) = ceiling(sqrt(5*10^n)), n > 1.