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A126809
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Number of terms required in the Gregory-Leibniz series, i.e. 4(1 - 1/3 + 1/5 - 1/7 + 1/9 - ...), for the first appearance of the decimal expansion of pi to occur.
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1
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OFFSET
| 1,1
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COMMENTS
| Calculations by Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu).
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EXAMPLE
| E.g. a(2)=19 because if 4 is multiplied by the sum of the first 19 terms of the alternating series, then the first two decimal digits of pi (3.1) occur for the first time.
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CROSSREFS
| Sequence in context: A005667 A098444 A139176 * A020073 A138977 A163605
Adjacent sequences: A126806 A126807 A126808 * A126810 A126811 A126812
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KEYWORD
| nonn,base
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AUTHOR
| G. L. Honaker, Jr. (honak3r(AT)gmail.com), Mar 14 2007
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EXTENSIONS
| a(6)-a(8) from Mike Keith (domnei(AT)aol.com), Mar 18 2007
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