A093847 First column of triangle A093846.

9, 54, 399, 3249, 27999, 249999, 2285713, 21249999, 199999999, 1899999999, 18181818180, 174999999999, 1692307692306, 16428571428570, 159999999999999, 1562499999999999, 15294117647058822, 149999999999999999

Offset

1,1

Links

G. C. Greubel, Table of n, a(n) for n = 1..995

Formula

a(n) = 10^(n-1) - 1 + floor(9*10^(n-1)/n) = A093846(n, 1). - R. J. Mathar, Jun 23 2006

Maple

A093847 := proc(n) RETURN (10^(n-1)-1+floor(9*(10^(n-1)/n))); end; for n from 1 to 20 do printf("%d, ", A093847(n)); od; # R. J. Mathar, Jun 23 2006

Mathematica

Table[10^(n-1)-1+Floor[9 10^(n-1)/n], {n, 20}] (* Harvey P. Dale, Oct 21 2011 *)

Prog

(PARI) {a(n) = 10^(n-1) -1 +floor(9*10^(n-1)/n)}; \\ G. C. Greubel, Mar 22 2019
(Magma) [10^(n-1) -1 +Floor(9*10^(n-1)/n): n in [1..20]]; // G. C. Greubel, Mar 22 2019
(Sage) [10^(n-1) -1 +floor(9*10^(n-1)/n) for n in (1..20)] # G. C. Greubel, Mar 22 2019

Crossrefs

Cf. A093846.

Sequence in context: A115784 A037599 A037704 * A363415 A157539 A205814

Adjacent sequences: A093844 A093845 A093846 * A093848 A093849 A093850

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 18 2004

Extensions

More terms from R. J. Mathar, Jun 23 2006

Edited by David Wasserman, Mar 26 2007

Status

approved