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Search: id:A138146
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| A138146 |
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Numbers with 2n-1 digits whose initial and final substring is "111" and whose others digits are 0s, but a(1)=1. |
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+0
4
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| 1, 111, 11111, 1110111, 111000111, 11100000111, 1110000000111, 111000000000111, 11100000000000111, 1110000000000000111, 111000000000000000111, 11100000000000000000111
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Bisection of A138145.
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EXAMPLE
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n ............ a(n)
1 ............. 1
2 ............ 111
3 ........... 11111
4 .......... 1110111
5 ......... 111000111
6 ........ 11100000111
7 ....... 1110000000111
8 ...... 111000000000111
9 ..... 11100000000000111
10 ... 1110000000000000111
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CROSSREFS
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Cf. A138144, A138145.
Sequence in context: A129051 A012039 A135577 this_sequence A100706 A111864 A098034
Adjacent sequences: A138143 A138144 A138145 this_sequence A138147 A138148 A138149
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Mar 29 2008, May 18 2008
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