|
Search: id:A138145
|
|
|
| A138145 |
|
Numbers with n digits whose initial and final substring is "111" and whose others digits are 0's, but a(1)=1 and a(2)=11. |
|
+0
6
|
|
| 1, 11, 111, 1111, 11111, 111111, 1110111, 11100111, 111000111, 1110000111, 11100000111, 111000000111, 1110000000111, 11100000000111, 111000000000111, 1110000000000111, 11100000000000111, 111000000000000111
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
EXAMPLE
|
n .... a(n)
1 .... 1
2 .... 11
3 .... 111
4 .... 1111
5 .... 11111
6 .... 111111
7 .... 1110111
8 .... 11100111
9 .... 111000111
10 ... 1110000111
11 ... 11100000111
12 ... 111000000111
13 ... 1110000000111
|
|
CROSSREFS
|
Cf. A000533, A138144.
Adjacent sequences: A138142 A138143 A138144 this_sequence A138146 A138147 A138148
Sequence in context: A138144 A090103 A061851 this_sequence A134962 A113589 A000042
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Omar E. Pol (info(AT)polprimos.com), Mar 29 2008
|
|
|
Search completed in 0.002 seconds
|
