### 5 Trillion Digits of Pi - Yes, Someone Calculated It!

## Feb 24, 2013

A Japanese man has broken the world record for calculating
the value of Pi, reaching 5 trillion digits on a computer that he built
himself.

A Japanese man has broken the world record for calculating
the value of Pi, reaching 5 trillion digits on a computer that he built
himself. Shigeru Kondo, a 55-year-old systems engineer for a food
company based in northern Japan, easily surpassed the previous record of 2.7
trillion digits, set late last year by a French engineer.

The calculation of the ratio of the circumference of a
circle to its diameter - usually abbreviated to 3.14 - took 90 days and seven
hours, according to the Kyodo news agency.

The mammoth calculation nearly came to grief on more than
one occasion, Mr Kondo said, including one morning when his daughter tripped a
circuit breaker when she turned a hair dryer on. The project was saved when the
computer switched to an emergency 10-minute back-up power source.

Mr Kondo was also forced to remove casings from the computer
and blow cool air onto the machine with fans as the temperature in his home
rose to 40 degrees in the hottest Japanese summer since 1946.

Mr Kondo's computer cost Y1.5 million (£11,550) to build and
has a hard-drive capacity of 32 terabytes. He plans to apply to the Guinness
Book of Records for recognition of his achievement.

His interest in calculating the value of pi dates back to
his college days, Kondo said, adding that as he only used an estimated 60
percent of the machine's capacity he intends to try to compute the value of Pi
to 10 trillion digits.

Mr Kondo's wife, Yukiko, 53, complained that the computer
used up a lot of energy during the three-month project and increased the
electricity bill to Y20,000 (£154) a month.

*Source: JulianRyall, The Telegraph 31 Aug 2010*

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