A035074 a(n) is root of square starting with digit 7: first term of runs.

27, 84, 265, 837, 2646, 8367, 26458, 83667, 264576, 836661, 2645752, 8366601, 26457514, 83666003, 264575132, 836660027, 2645751312, 8366600266, 26457513111, 83666002654, 264575131107, 836660026535, 2645751311065

Offset: 2

Author

Patrick De Geest, Nov 15 1998

Keywords

• nonn
• base

Crossrefs

Cf. A067477 (squares), A035076 (2..9).

Programs

Mathematica

Ceiling[Sqrt[7*10^Range[2,30]]] (* Harvey P. Dale, Jan 21 2015 *)

Formula

a(n) = ceiling(sqrt(7*10^n)), n > 1.