A035069 a(n) is root of square starting with digit 2: first term of runs.

5, 15, 45, 142, 448, 1415, 4473, 14143, 44722, 141422, 447214, 1414214, 4472136, 14142136, 44721360, 141421357, 447213596, 1414213563, 4472135955, 14142135624, 44721359550, 141421356238, 447213595500, 1414213562374

Offset

1,1

Links

Table of n, a(n) for n=1..24.

Formula

a(n) = ceiling(sqrt(2*10^n)).

Mathematica

Table[Ceiling @ Sqrt[2 * 10^n], {n, 1, 24}] (* Amiram Eldar, Oct 08 2019 *)

Crossrefs

Cf. A067472 (squares), A035076 (2..9).

Sequence in context: A200664 A099235 A207096 * A176611 A001869 A058425

Adjacent sequences: A035066 A035067 A035068 * A035070 A035071 A035072

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Extensions

Offset 1 from Michel Marcus, Oct 08 2019

Status

approved