Using IBM’s “BlueGene/P” supercomputer, researchers have computed binary digits of pisquared beginning at the 60 trillionth binary digit.
This news was reported on the Math Drudge blog run by David Bailey and Jonathan Borwein and are grateful for their permission to repost it here.
Two IBM researchers, with the assistance of the present bloggers (Bailey and Borwein), have calculated binary digits of pisquared beginning at the 60 trillionth binary digit. In addition, they calculated ternary (base3) digits of pisquared, beginning at the 60 trillionth digit, and binary digits of Catalan's constant, beginning at the 120 trillionth digit.
These calculations would have taken a single computer processor unit (CPU) 1,500 years to calculate, but the researchers managed to complete this work in just a few months on IBM's "BlueGene/P" supercomputer, which is designed to run continuously at one quadrillion calculations per second.
These calculations were based on some mathematical formulas published in a 1997 paper by David H. Bailey (one of the present bloggers), Peter Borwein (Jonathan's brother), and Simon Plouffe of Canada. These formulas have the remarkable property that they permit one to calculate binary digits (or, in some cases, ternary digits or digits in other number bases) of various mathematical constants, beginning at an arbitrary position, without needing to calculate any of the digits than came before. These formulas were originally discovered by computer programs, using the "PSLQ" algorithm of sculptormathematician Helaman Ferguson. For the computation of digits of Catalan's constant described here, an improved formula was found by the present authors.
Just for the record:
1. The first 12 base8 digits of pisquared beginning at position 20 trillion (corresponding to binary position 60 trillion) are: 601145053032.
2. The first 12 base9 digits of pisquared beginning at position 30 trillion (corresponding to ternary position 60 trillion) are: 122644850645.
3. The first 12 base8 digits of Catalan's constant beginning at position 40 trillion (corresponding to binary position 120 trillion) are: 347050537747.
Full details are available in this online manuscript:
BBPBluegene paper
A news article on the calculation, published on the U.S. Department of Energy's Office of Science website is available.
Last September other researchers calculated binary digits of pi itself, beginning at the two quadrillionth binary digit (see Yahoo! Gets to the 2 Quadrillionth bit of Pi) also using the Bailey–Borwein–Plouffe formula.
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