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

Author

Amarnath Murthy, Apr 18 2004

Keywords

• base
• easy
• nonn

Links

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

Crossrefs

Cf. A093846.

Programs

Magma

[10^(n-1) -1 +Floor(9*10^(n-1)/n): n in [1..20]]; // G. C. Greubel, Mar 22 2019

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 *)

PARI

{a(n) = 10^(n-1) -1 +floor(9*10^(n-1)/n)}; \\ 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

Formula

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

Extensions

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

Edited by David Wasserman, Mar 26 2007