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A147589
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Concatenation of 2n-1 digits 1 and n-1 digits 0.
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1
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1, 1110, 1111100, 1111111000, 1111111110000, 1111111111100000, 1111111111111000000, 1111111111111110000000, 1111111111111111100000000, 1111111111111111111000000000, 1111111111111111111110000000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(n) is also A147590(n) written in base 2.
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FORMULA
| a(n) = A138118(n)/10.
a(n)={[10^(2*n-1)-1]*10^(n-1)}/9, with n>=1 [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 26 2008]
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EXAMPLE
| n .......... a(n)
1 ........... 1
2 ......... 1110
3 ....... 1111100
4 ..... 1111111000
5 ... 1111111110000
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CROSSREFS
| Cf. A138118, A147537, A147590.
Sequence in context: A066163 A036105 A036103 * A086887 A100846 A176670
Adjacent sequences: A147586 A147587 A147588 * A147590 A147591 A147592
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KEYWORD
| easy,nonn,base
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 08 2008
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EXTENSIONS
| Keyword:base added by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 28 2010
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