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A319358
a(n) = (10^n - 1)^9.
4
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
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
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 17 2018
STATUS
approved