|
|
A173772
|
|
(4*10^n + 23)/9.
|
|
4
|
|
|
7, 47, 447, 4447, 44447, 444447, 4444447, 44444447, 444444447, 4444444447, 44444444447, 444444444447, 4444444444447, 44444444444447, 444444444444447, 4444444444444447, 44444444444444447, 444444444444444447
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 10*a(n-1)-23 with n>1, a(1)=7.
a(n) = 11*a(n-1)-10*a(n-2). G.f.: -x*(30*x-7)/((x-1)*(10*x-1)). [Colin Barker, Jan 24 2013]
|
|
MATHEMATICA
|
LinearRecurrence[{11, -10}, {7, 47}, 30] (* or *) Table[FromDigits[ PadLeft[ {7}, n, 4]], {n, 30}] (* Harvey P. Dale, Dec 27 2014 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|