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Search: id:A135319
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| A135319 |
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a(n) is the first digit after the decimal point in the decimal expansion of log_10(n), i.e. of the Briggsian logarithm of n. |
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+0
1
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| 0, 3, 4, 6, 6, 7, 8, 9, 9, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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Erwin Voellmy: "Fuenfstellige Logarithmen und Zahlentafeln". 15th edition, Orell Foessli Verlag, Zurich (1962).
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FORMULA
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a(n) = floor(10(log_10(n) - floor log_10(n))).
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EXAMPLE
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E.g. a(6) = 7, because log_10(6) = 0.77815...
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MAPLE
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A135319 := proc(n) floor(10*log[10](n)) mod 10 ; end: seq(A135319(n), n=1..80) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 11 2008
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CROSSREFS
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Sequence in context: A031131 A105321 A160095 this_sequence A004219 A077542 A023836
Adjacent sequences: A135316 A135317 A135318 this_sequence A135320 A135321 A135322
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KEYWORD
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base,easy,nonn
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AUTHOR
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Pahikkala Jussi (pahio(AT)wakkanet.fi), Dec 06 2007, Jan 13 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and N. J. A. Sloane (njas(AT)research.att.com), Jan 11 2008
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