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Search: id:A110756
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| A110756 |
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a(n) = tau(N), where N = concatenation 1,2,3,...,n. |
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+0
5
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| 1, 6, 4, 4, 8, 28, 4, 24, 12, 8, 64, 32, 8, 8, 8, 12, 24, 48, 64, 192, 256, 64, 16, 48, 24, 160, 96, 64, 16, 128, 8, 48, 64, 4, 192, 120, 16, 16, 64, 384, 32, 128, 16, 48, 768, 128, 32, 192, 64, 768, 8, 32, 64, 1792, 32, 24
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = A000005[A007908(n)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2007
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EXAMPLE
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a(3) = tau(123) = 4.
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MAPLE
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A055642 := proc(n) 1+floor(log10(n)) ; end; A000005 := proc(n) numtheory[tau](n) ; end ; A007908 := proc(n) local a ; a := 1 ; for i from 2 to n do a := a*10^A055642(i)+i ; end; RETURN(a) ; end; A110756 := proc(n) A000005(A007908(n)) ; end; for n from 1 to 50 do printf("%d %d ", n, A110756(n)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2007
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CROSSREFS
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Cf. A110757, A110758, A110759, A110760.
Sequence in context: A095156 A029680 A021612 this_sequence A013661 A019174 A019166
Adjacent sequences: A110753 A110754 A110755 this_sequence A110757 A110758 A110759
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KEYWORD
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base,hard,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 11 2005
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2007
More terms from David Wasserman (dwasserm(AT)earthlink.net), Dec 22 2008
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