cp's OEIS Frontend

A077644 Number of decimal digits of A070177(n).

%I A077644 #28 May 08 2018 15:11:55
%S A077644 1,2,9,32,107,347,1108,3515,11132,35219,111391,352269,1113996,3522791,
%T A077644 11140072,35228031,111400846,352280442,1114008610,3522804578,
%U A077644 11140086260
%N A077644 Number of decimal digits of A070177(n).
%D A077644 Richard P. Stanley, Enumerative Combinatorics, Cambridge University Press, April 1997, p. 79.
%H A077644 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy] p. 825.
%H A077644 Fredrik Johansson, <a href="http://arxiv.org/abs/1205.5991">Efficient implementation of the Hardy-Ramanujan-Rademacher formula</a>, 2012 preprint, to be published in LMS Journal of Computation and Mathematics.
%H A077644 Fredrik Johansson, <a href="http://fredrikj.net/blog/2014/03/new-partition-function-record/">New partition function record: p(10^20) computed</a> (2014)
%H A077644 Herbert S. Wilf, <a href="http://www.math.upenn.edu/~wilf/PIMS/PIMSLectures.pdf">Lectures on Integer Partitions</a>
%F A077644 a(n) = (Pi*sqrt(2/3)*sqrt(10)^n-log(48)/2-n*log(10))/log(10) + O(1). - _Charles R Greathouse IV_, Jul 10 2012
%e A077644 p(10^3) = 24061467864032622473692149727991 has 32 decimal digits, so a(3) = 32.
%t A077644 f[n_] := Floor[ Log[10, PartitionsP[10^n]] + 1]; Array[f, 13, 0]
%o A077644 (PARI) a(n)=#Str(numbpart(10^n)) \\ _Charles R Greathouse IV_, Jul 09 2012
%Y A077644 Cf. A070177.
%K A077644 nonn,base,more
%O A077644 0,2
%A A077644 _Labos Elemer_, Nov 15 2002
%E A077644 a(0), a(10)-a(12), a(15)=35228031 from _Robert G. Wilson v_, Jun 08 2010
%E A077644 a(13)-a(19) from _Charles R Greathouse IV_, Jul 09 2012 based on Johansson 2012
%E A077644 a(20) from _Robert G. Wilson v_, Mar 02 2014