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Search: id:A138146
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| A138146 |
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Palindromes with 2n-1 digits formed from the reflected decimal expansion of the concatenation of 1, 1, 1 and infinite 0's. |
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+0
17
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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.
a(n) is also A147597(n) written in base 2. [From Omar E. Pol (info(AT)polprimos.com), Nov 08 2008]
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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.
Cf. A138118, A138119, A138120, A138721, A138826, A147597. [From Omar E. Pol (info(AT)polprimos.com), Nov 08 2008]
Sequence in context: A135577 A153498 A152764 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,base
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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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EXTENSIONS
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Better definition. - Omar E. Pol (info(AT)polprimos.com), Nov 16 2008
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