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Search: id:A147816
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| A147816 |
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Concatenation of n digits 1 and 2(n-1) digits 0. |
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+0
2
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| 1, 1100, 1110000, 1111000000, 1111100000000, 1111110000000000, 1111111000000000000, 1111111100000000000000, 1111111110000000000000000, 1111111111000000000000000000, 1111111111100000000000000000000
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) is also A016152(n) written in base 2.
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FORMULA
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a(n) = A138119(n)/10.
a(n)=[(10^n-1)*10^(2*n-2)]/9, with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Nov 26 2008]
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EXAMPLE
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n ...... a(n)
1 ....... 1
2 ...... 1100
3 ..... 1110000
4 .... 1111000000
5 ... 1111100000000
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CROSSREFS
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Cf. A000533, A016152, A135577, A138119, A138120, A138144, A138145, A138146, A138721, A138826, A147757, A147759.
Sequence in context: A123366 A096926 A078199 this_sequence A050926 A083933 A080317
Adjacent sequences: A147813 A147814 A147815 this_sequence A147817 A147818 A147819
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KEYWORD
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base,easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 13 2008
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