C. Ryan Vinroot,
following their integer relation
approach (re)-discovered the following alternate formula:
Adamchik and Wagon [Am. Math. Monthly, Nov. 1997;
give the following pretty variant:
Their solution is dependent on the two given above as follows:
which is 2 times BBP plus 1 times our variant.
Fabrice Bellard has given a formula for base 210, which allows a faster algorithm for computing the hexadecimal digits of .
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