|
| |
|
|
A147816
|
|
Concatenation of n digits 1 and 2(n-1) digits 0.
|
|
1
| |
|
|
1, 1100, 1110000, 1111000000, 1111100000000, 1111110000000000, 1111111000000000000, 1111111100000000000000, 1111111110000000000000000, 1111111111000000000000000000, 1111111111100000000000000000000
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| a(n) is also A016152(n) written in base 2.
|
|
|
FORMULA
| a(n) = A138119(n)/10.
a(n)=[(10^n-1)*10^(2*n-2)]/9, with n>=1 [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 26 2008]
|
|
|
EXAMPLE
| n ...... a(n)
1 ....... 1
2 ...... 1100
3 ..... 1110000
4 .... 1111000000
5 ... 1111100000000
|
|
|
CROSSREFS
| Cf. A000533, A016152, A135577, A138119, A138120, A138144, A138145, A138146, A138721, A138826, A147757, A147759.
Sequence in context: A186476 A096926 A078199 * A050926 A083933 A080317
Adjacent sequences: A147813 A147814 A147815 * A147817 A147818 A147819
|
|
|
KEYWORD
| base,easy,nonn
|
|
|
AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 13 2008
|
| |
|
|
