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A021243
Decimal expansion of 1/239.
1
0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0, 0, 4, 1, 8, 4, 1, 0
OFFSET
0,3
LINKS
Eric Weisstein's World of Mathematics, Machin-Like Formulas
FORMULA
From Jean-François Alcover, Sep 14 2015: (Start)
Pi = 16 arctan(1/5) - 4 arctan(1/239) [Machin's formula],
arctan(1/239) = arctan(1/70) - arctan(1/99) = arctan(1/408) + arctan(1/577),
1/239 = 4649 / 1111111. (End)
CROSSREFS
Sequence in context: A263498 A198314 A105534 * A340531 A096051 A350637
KEYWORD
nonn,cons
AUTHOR
STATUS
approved