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A276780
a(n) = floor(log_10(1/error(n))), where error(n) is the error in the n-th iteration of the quartic Borwein-Borwein algorithm for computing 1/Pi.
3
9, 41, 171, 694, 2790, 11172, 44702, 178825, 715319, 2861297, 11445210, 45780865, 183123485, 301029988, 301029988
OFFSET
1,1
REFERENCES
J. M. Borwein and P. B. Borwein, Pi and the AGM, Wiley, 1987.
LINKS
D. H. Bailey, J. M. Borwein, P. B. Borwein, and S. Plouffe, The Quest for Pi, Mathematical Intelligencer, vol. 19, no. 1 (Jan. 1997), 50-57.
Lucas A. Brown, Python program.
Doron Zeilberger, Jonathan Borwein (1951-2016), a PiONEER of Experimental Mathematics, Experimental Mathematics Seminar, Rutgers University, Sep 15 2016.
CROSSREFS
Sequence in context: A201275 A056243 A083584 * A183916 A199311 A146239
KEYWORD
nonn,hard,more
AUTHOR
Doron Zeilberger, Sep 18 2016
EXTENSIONS
Revised definition and terms a(9)-a(15) from Lucas A. Brown, May 05 2023
STATUS
approved