|
|
A245429
|
|
Number of nonnegative integers with property that their base 9/7 expansion (see A024655) has n digits.
|
|
0
|
|
|
9, 9, 9, 9, 18, 18, 27, 36, 45, 54, 72, 90, 117, 153, 198, 252, 324, 414, 531, 684, 882, 1134, 1458, 1872, 2412, 3096, 3978, 5121, 6579, 8460, 10881, 13986, 17982, 23121, 29727, 38223, 49140, 63180, 81234, 104445, 134280, 172647, 221976, 285399, 366939, 471780
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
a(2) = 9 because 70, 71, 72, 73, 74, 75, 76, 77 and 78 are the base 9/7 expansions for the integers 9, 10, 11, 12, 13, 14, 15, 16 and 17 respectively and these are the only integers with 2 digits.
|
|
PROG
|
(Sage)
A=[1]
for i in [1..60]:
A.append(ceil(((9-7)/7)*sum(A)))
[9*x for x in A]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|