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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

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.


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