A089303 a(n) = floor( (10^n - 1) / (9*n) ).

1, 5, 37, 277, 2222, 18518, 158730, 1388888, 12345679, 111111111, 1010101010, 9259259259, 85470085470, 793650793650, 7407407407407, 69444444444444, 653594771241830, 6172839506172839, 58479532163742690, 555555555555555555

Offset

1,2

Comments

Previous name was "Concatenation of 1 n times divided by n." - Michael Somos, May 31 2014

Links

Robert Israel, Table of n, a(n) for n = 1..1000

Formula

a(n) = floor((10^n-1)/(9n)).

Maple

f:=  n -> floor((10^n-1)/(9*n)):
map(f, [$1..100]); # Robert Israel, Oct 30 2019

Mathematica

Table[Floor[(10^n-1)/(9n)], {n, 20}] (* Harvey P. Dale, Dec 06 2018 *)

Prog

(Sage) [floor(gaussian_binomial(n, 1, 10)/n) for n in range(1, 21)] # - Zerinvary Lajos, May 29 2009

Crossrefs

Cf. A002275.

Sequence in context: A083232 A236581 A262410 * A164595 A046636 A091126

Adjacent sequences: A089300 A089301 A089302 * A089304 A089305 A089306

Keyword

nonn

Author

Amarnath Murthy, Oct 31 2003

Extensions

More terms from Sam Alexander, Feb 27 2004

Status

approved