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 A135319 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. 1
 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; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Erwin Voellmy, Fünfstellige Logarithmen und Zahlentafeln, 15th edition, Orell Foessli Verlag, Zurich (1962). LINKS Table of n, a(n) for n=1..99. Wikipedia, Common logarithm FORMULA a(n) = floor(10*(log_10(n) - floor(log_10(n)))). EXAMPLE a(6) = 7, because log_10(6) = 0.77815... MAPLE A135319 := proc(n) floor(10*log[10](n)) mod 10 ; end: seq(A135319(n), n=1..80) ; # R. J. Mathar, Jan 11 2008 CROSSREFS Sequence in context: A217032 A300305 A160095 * A329193 A004219 A077542 Adjacent sequences: A135316 A135317 A135318 * A135320 A135321 A135322 KEYWORD base,easy,nonn AUTHOR Pahikkala Jussi, Dec 06 2007, Jan 13 2008 EXTENSIONS More terms from R. J. Mathar and N. J. A. Sloane, Jan 11 2008 STATUS approved

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Last modified August 2 21:27 EDT 2024. Contains 374875 sequences. (Running on oeis4.)