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 A046654 Nearest integer to Sum_{k=1..n} log(k) = log(n!). 9
 0, 0, 1, 2, 3, 5, 7, 9, 11, 13, 15, 18, 20, 23, 25, 28, 31, 34, 36, 39, 42, 45, 48, 52, 55, 58, 61, 65, 68, 71, 75, 78, 82, 85, 89, 92, 96, 99, 103, 107, 110, 114, 118, 122, 125, 129, 133, 137, 141, 145, 148, 152, 156, 160, 164, 168, 172, 176, 180 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS a(n) is also the nearest integer to log(n!). - Eric M. Schmidt, Jun 19 2015 Log(n!) is asymptotic to A275341. - Mats Granvik, Aug 02 2016 Stirling's approximation s(n) = n*log(n) - n + log(2*Pi*n)/2 is known to be equal to log(n!) up to an error between 1/(12n + 1) and 1/12n. For all 0 < n < 10^6 except for n = 11, round(s(n)) = a(n). What is the next such exceptional index n? - M. F. Hasler, Dec 03 2018 REFERENCES G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers, 5th ed., Oxford Univ. Press, 1979, Section 22.1. LINKS Eric M. Schmidt, Table of n, a(n) for n = 0..10000 (corrected by Sean A. Irvine, Jan 18 2019) FORMULA a(n) = n*log(n) - n + O(log(n)). - Arkadiusz Wesolowski, Oct 18 2013 a(n) = round(LogGamma(n + 1)). - Mats Granvik, Roger L. Bagula, Aug 06 2016 a(n) = round(log(Product_{k=1..n} A139547(n,k))). - Mats Granvik, Aug 07 2016 MATHEMATICA nn = 58; t = Accumulate[Log /@ Range[nn]]; Table[If[(y = Ceiling[x = t[[i]]]) - x <= x - (z = Floor[x]), a = y, a = z]; a, {i, nn}] (* Jayanta Basu, Jun 27 2013 *) PROG (MAGMA) [Round(Log(Factorial(n))): n in [2..100]]; // Vincenzo Librandi, Jun 19 2015 (PARI) A046654(n)=round(lngamma(n+1)) \\ M. F. Hasler, Dec 03 2018 CROSSREFS Cf. A025201. Sequence in context: A095737 A054022 A185603 * A280724 A023543 A129895 Adjacent sequences:  A046651 A046652 A046653 * A046655 A046656 A046657 KEYWORD nonn AUTHOR N. J. A. Sloane, Dec 27 1999 EXTENSIONS Name edited and a(0) = 0 prepended by M. F. Hasler, Dec 03 2018 STATUS approved

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Last modified August 25 21:00 EDT 2019. Contains 326324 sequences. (Running on oeis4.)