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A001203
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Continued fraction expansion of Pi.
(Formerly M2646 N1054)
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38
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3, 7, 15, 1, 292, 1, 1, 1, 2, 1, 3, 1, 14, 2, 1, 1, 2, 2, 2, 2, 1, 84, 2, 1, 1, 15, 3, 13, 1, 4, 2, 6, 6, 99, 1, 2, 2, 6, 3, 5, 1, 1, 6, 8, 1, 7, 1, 2, 3, 7, 1, 2, 1, 1, 12, 1, 1, 1, 3, 1, 1, 8, 1, 1, 2, 1, 6, 1, 1, 5, 2, 2, 3, 1, 2, 4, 4, 16, 1, 161, 45, 1, 22, 1, 2, 2, 1, 4, 1, 2, 24, 1, 2, 1, 3, 1, 2, 1
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The first 5,821,569,425 terms were computed by Eric Weisstein on Sep 18 2011.
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REFERENCES
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P. Beckmann, "A History of Pi".
C. Brezinski, History of Continued Fractions ans Pade' Approximants, Springer-Verlag, 1991; pp. 151-152.
K. Y. Choong, D. E. Daykin and C. R. Rathbone, Regular continued fractions for pi and gamma, Math. Comp., 25 (1971), 403.
J. R. Goldman, The Queen of Mathematics, 1998, p. 50.
R. S. Lehman, A Study of Regular Continued Fractions. Report 1066, Ballistic Research Laboratories, Aberdeen Proving Ground, Maryland, Feb 1959.
G. Lochs, Die ersten 968 Kettenbruchnenner von Pi. Monatsh. Math. 67 1963 311-316.
C. D. Olds, Continued Fractions, Random House, NY, 1963; front cover of paperback edition.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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N. J. A. Sloane, Table of n, a(n) for n = 1..20000 [from the Plouffe web page]
James Barton, Simple Continued Fraction Expansion of Pi [From Lekraj Beedassy, Oct 27 2008]
E. Bombieri and A. J. van der Poorten, Continued fractions of algebraic numbers
Exploratorium, 180 million terms of the simple CFE of pi
B. Gourevitch, L'univers de Pi
H. Havermann, Simple Continued Fraction for Pi [a 483 MB file containing 180 million terms]
_Simon Plouffe_, 20 megaterms of this sequence as computed by Hans Havermann
Eric Weisstein's World of Mathematics, Pi Continued Fraction
Eric Weisstein's World of Mathematics, Pi
G. Xiao, Contfrac
Index entries for continued fractions for constants
Index entries for sequences related to the number Pi
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EXAMPLE
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Pi = 3.1415926535897932384... = 3 + 1/(7 + 1/(15 + 1/(1 + 1/(292 + ...))))
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MAPLE
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cfrac (Pi, 70, 'quotients'); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 10 2007
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MATHEMATICA
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ContinuedFraction[Pi, 98]
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PROG
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(PARI) contfrac(Pi) \\ contfracpnqn(%) is also useful!
(PARI) { allocatemem(932245000); default(realprecision, 21000); x=contfrac(Pi); for (n=1, 20000, write("b001203.txt", n, " ", x[n])); } [From Harry J. Smith, Apr 14 2009]
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CROSSREFS
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Cf. A000796 for decimal expansion. See A007541 or A033089, A033090 for records.
Cf. A097545, A097546.
Sequence in context: A146155 A106363 A128658 * A154883 A109732 A114396
Adjacent sequences: A001200 A001201 A001202 * A001204 A001205 A001206
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KEYWORD
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nonn,nice,cofr
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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