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A035069 a(n) is root of square starting with digit 2: first term of runs. 3
5, 15, 45, 142, 448, 1415, 4473, 14143, 44722, 141422, 447214, 1414214, 4472136, 14142136, 44721360, 141421357, 447213596, 1414213563, 4472135955, 14142135624, 44721359550, 141421356238, 447213595500, 1414213562374 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 00:21 EST 2021. Contains 349530 sequences. (Running on oeis4.)