|
Search: id:A126809
|
|
|
| A126809 |
|
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. |
|
+0
2
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Calculations by Jud McCranie (j.mccranie(AT)comcast.net).
|
|
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.
|
|
CROSSREFS
|
Sequence in context: A005667 A098444 A139176 this_sequence A020073 A138977 A163605
Adjacent sequences: A126806 A126807 A126808 this_sequence A126810 A126811 A126812
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
G. L. Honaker, Jr. (honak3r(AT)gmail.com), Mar 14 2007
|
|
EXTENSIONS
|
a(6)-a(8) from Mike Keith (domnei(AT)aol.com), Mar 18 2007
|
|
|
Search completed in 0.002 seconds
|
