Jul

03

2005

Remember this number, 3.14159? It's Pi, the natural number that describes the mathematical properties of a circle. Well, the digits for Pi go on and on and on (for infinity actually) and that makes for some fun competitions and great feats of memory. As a matter of fact a 59-year-old Japanese psychiatric counselor, Akira Haraguchi, has recently broken the world record for reciting the digits of Pi from **memory**. From the time he started at 3.14 to the time he ended 13 hours later he recited 42,195 digits of Pi.

Can you imagine memorizing that many numbers? Check out the first 10,000 digits of Pi to see how hard it is to remember that many numbers. And if that doesn't wear you out, try for the record by checking out the first 100,000 digits of Pi.

To learn more about the fun aspects of Pi, check out the Exploratorium's Ridiculously Enhanced Pi Page. Every March 14th, international Pi day, in San Francisco the Exploratorium hosts a Pi festival with lots of fun activities, including real pie.

To learn more about human memory, check out the BBC's Human Body and Memory Tests website. You can explore some amazing facts about the human mind but also take a number of surveys to test your own memory.

this is absolutely amazing information i couldn't believe a guy could actually do that kind of thing

I know the last character of pi...\r\nit's...\r\ne\r\nhehe...!

Har har, very funny.

I appreciate that you keep this blog going and allow comments. To me feedback is an interesting part of a blog.

hi..i like pi and i think you should post all the numbers of pi. some people found out where pi ends using a super computer.

Can you tell us where you heard that pi had been solved? I just surfed the web, and couldn't find any reference to that. And something like that would be BIG news!

I did, however, discover two things:

a) in 1995, a scientist in Tokyo, Japan calculated pi to over 6.4

places.billionb) according to the Exploratorium site above, just one billion places of pi would stretch from New York to about the middle of the US. So six billion would stretch from NY to LA, back to NY,

backto LA, and still have enoough left over to get down to San Diego to catch a Padres game.So, I don't think we'll be posting all the numbers of pi any time soon. ;-)

pi does not end........

what if iwere to change the units used into radian? what would the formulas be then? please explain

The formula for pi is always circumference divided by diameter. The units of measure used don't make any difference.

you can't find pi its an irrational number, if it has been solved it's probbably a hoax.

I am 13, and I learned 150 digits of pi in 3 hours, and am able to recite them from memory in about 30 seconds.I am continuously learning more.

how!

what kind of a life did he live

Hey guys, I''m 10 years old with 501 digits of pi! It was easy to memorize. I'm aiming for 601 this year.

Didn't you ever think of putting it down here?

Interesting article, i have bookmarked your blog for future referrence

hey guys, I'm 16 years old and I've memorized pi to about 2130 places. The trick is memorize sequences of numbers and then string them together. My goal is 10000 places by the time I'm out of high school. I'll tell you how it goes:)

WOW I feel dumb when I look at the equations for PI π

## Post new comment