A035070 a(n) is root of square starting with digit 3: first term of runs.

6, 18, 55, 174, 548, 1733, 5478, 17321, 54773, 173206, 547723, 1732051, 5477226, 17320509, 54772256, 173205081, 547722558, 1732050808, 5477225576, 17320508076, 54772255751, 173205080757, 547722557506, 1732050807569, 5477225575052, 17320508075689, 54772255750517

Offset

1,1

Links

Michael S. Branicky, Table of n, a(n) for n = 1..1999

Formula

a(n) = ceiling(sqrt(3*10^n)).

Mathematica

Table[Ceiling @ Sqrt[3 * 10^n], {n, 1, 24}] (* Amiram Eldar, Oct 08 2019 *)

Prog

(Python)
from math import isqrt
def a(n): return isqrt(3*10**n) + 1
print([a(n) for n in range(1, 28)]) # Michael S. Branicky, Jun 18 2021

Crossrefs

Cf. A067473 (squares), A035076 (2..9).

Sequence in context: A183913 A056349 A278768 * A075386 A056343 A363517

Adjacent sequences: A035067 A035068 A035069 * A035071 A035072 A035073

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Extensions

Offset 1 from Alois P. Heinz, Oct 08 2019

Status

approved