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Search: id:A000461
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| A000461 |
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Concatenate n n times. |
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+0
15
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| 1, 22, 333, 4444, 55555, 666666, 7777777, 88888888, 999999999, 10101010101010101010, 1111111111111111111111, 121212121212121212121212, 13131313131313131313131313, 1414141414141414141414141414
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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F. Smarandache, "Properties of the numbers", Univ. of Craiova Archives, 1975; Arizona State University Special Collections, Tempe, AZ.
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LINKS
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M. L. Perez et al., eds., Smarandache Notions Journal
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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a(n)=n*(10^(n*L(n))-1)/(10^L(n)-1) where L(n)=A004216(n)+1=floor[log10(10n)] - Henry Bottomley (se16(AT)btinternet.com), Jun 01 2000
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CROSSREFS
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Cf. A048376, A053422.
Sequence in context: A025936 A048376 A053422 this_sequence A048795 A068186 A021284
Adjacent sequences: A000458 A000459 A000460 this_sequence A000462 A000463 A000464
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KEYWORD
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nonn,base,easy
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AUTHOR
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John Radu (Suttones(AT)aol.com)
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