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Search: id:A108047
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| A108047 |
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Concatenation of pairs of numbers with the first two terms 1 and 1. |
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+0
2
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| 1, 1, 11, 111, 11111, 11111111, 1111111111111, 111111111111111111111, 1111111111111111111111111111111111, 1111111111111111111111111111111111111111111111111111111, 11111111111111111111111111111111111111111111111111111111111111111111111111111111\ 111111111, 11111111111111111111111111111111111111111111111111111111111111111111111111111111\ 1111111111111111111111111111111111111111111111111111111111111111
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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(10^F(n)-1)/9.
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FORMULA
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a(n)=A037842(n-2), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 24 2008]
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EXAMPLE
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The third term is 11 which is the concatenation of the first two terms 1 and 1.
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CROSSREFS
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Sequence in context: A015468 A037842 A131293 this_sequence A144784 A030175 A058949
Adjacent sequences: A108044 A108045 A108046 this_sequence A108048 A108049 A108050
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jun 01 2005
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