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

2,1

Links

Table of n, a(n) for n=2..24.

Formula

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

Mathematica

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

Crossrefs

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

Sequence in context: A043182 A039359 A043962 * A036925 A281090 A260052

Adjacent sequences: A035071 A035072 A035073 * A035075 A035076 A035077

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Status

approved