|
|
A205084
|
|
a(n)=n 4's sandwiched between two 1's.
|
|
0
|
|
|
11, 141, 1441, 14441, 144441, 1444441, 14444441, 144444441, 1444444441, 14444444441, 144444444441, 1444444444441, 14444444444441, 144444444444441, 1444444444444441, 14444444444444441, 144444444444444441, 1444444444444444441, 14444444444444444441
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
|
|
FORMULA
|
a(0)=11, a(n)=10*a(n-1)+31.
a(n) = (130*10^n-31)/9 (see PARI's code by Charles R Greathouse IV).
|
|
MATHEMATICA
|
a[0]=11; a[n_]:=a[n-1]*10+31; Table[a[n], {n, 0, 44}]
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy,base,less
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|