A140576 Numbers of the form i*9^j-1 (i=1..8, j >= 0).

0, 1, 2, 3, 4, 5, 6, 7, 8, 17, 26, 35, 44, 53, 62, 71, 80, 161, 242, 323, 404, 485, 566, 647, 728, 1457, 2186, 2915, 3644, 4373, 5102, 5831, 6560, 13121, 19682, 26243, 32804, 39365, 45926, 52487, 59048, 118097, 177146, 236195, 295244, 354293, 413342, 472391, 531440, 1062881

Offset

1,3

Comments

A base-9 analog of A051885.

Links

Table of n, a(n) for n=1..50.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,9,-9).

Formula

G.f.: x^2*(x+1)*(x^2+1)*(x^4+1) / ((x-1)*(3*x^4-1)*(3*x^4+1)). [Colin Barker, Feb 01 2013]

Crossrefs

Smallest number whose base b sum of digits is n: A000225 (b=2), A062318 (b=3), A180516 (b=4), A181287 (b=5), A181288 (b=6), A181303 (b=7), A165804 (b=8), this sequence (b=9), A051885 (b=10). - Jason Kimberley, Nov 02 2011

Sequence in context: A115309 A171722 A146029 * A200447 A274840 A205406

Adjacent sequences: A140573 A140574 A140575 * A140577 A140578 A140579

Keyword

nonn,easy

Author

N. J. A. Sloane, Jan 25 2011

Status

approved