A319358 a(n) = (10^n - 1)^9.

0, 387420489, 913517247483640899, 991035916125874083964008999, 999100359916012598740083996400089999, 999910003599916001259987400083999640000899999, 999991000035999916000125999874000083999964000008999999

Offset

0,2

Comments

Number of 9 in a(n) is 5*n-8 for n > 2.

Links

Seiichi Manyama, Table of n, a(n) for n = 0..100

Formula

a(n) = A002283(n)^9.

Example

n|   a(n) can be divided into 9 parts for n > 3.
-+------------------------------------------------------
3|   99   1035   9   16125      874083   9   64008   999
4|  999  10035  99  160125  9  8740083  99  640008  9999
5| 9999 100035 999 1600125 99 87400083 999 6400008 99999

Mathematica

a[n_]:=(10^n - 1)^9 ; Array[a,  50, 0] (* Stefano Spezia, Sep 17 2018 *)

Prog

(PARI) {a(n) = (10^n-1)^9}

Crossrefs

Cf. A001017, A002283, A059988, A272067, A272068.

Sequence in context: A017385 A017505 A017637 * A276274 A058125 A175280

Adjacent sequences: A319355 A319356 A319357 * A319359 A319360 A319361

Keyword

nonn

Author

Seiichi Manyama, Sep 17 2018

Status

approved