## Wednesday Is Pi Day 282

Posted
by
kdawson

from the secant-tangent-cosine-sine dept.

from the secant-tangent-cosine-sine dept.

mrbluze points us to an AP writeup on the upcoming Pi Day — 3-14 (which some will observe at 1:59 pm). The article notes:

*"[T]he world record [for reciting the number Pi] belongs to Chao Lu, a Chinese chemistry student, who rattled off 67,890 digits over 24 hours in 2005. It took 26 video tapes to submit to Guinness,"*and mentions in passing a Japanese mental health counselor who last fall recited 100,000 digits, but did not choose to submit proof to the record book.
## Re:Perhaps a typo? (Score:3, Interesting)

## 1337 (Score:5, Interesting)

## Re:I live in Europe (Score:5, Interesting)

Here at my office we use both the European and International numerican dates forms, depending on the sitation:

European: DD/MM/YYYY

International: YYYY/MM/DD

As you can the units of time (days, months, years) ascend or descend in order e.g. in the European format you go from the smallest unit (days) through the midsized (months) up to the largest (years). In the International format the same descends from largest first.

But with the American format you start with the month, then go to the smallest, then to the largest. It just seems totally illogical to me, anyone know why it's done that way?

## Re:100000 digits? (Score:4, Interesting)

There are plenty of memory techniques. Didn't you know there is a world championship in remembering things? See for instance http://www.worldmemorychampionship.com/ [worldmemor...onship.com] or http://www.worldmemorychallenge.com/ [worldmemorychallenge.com].

If you want a tip, here's something a read in a book by a Norwegian memory world champion, Oddbjørn By:

*You probably want less locations, so you can visit the same one under different conditions. E.g. during day / night / rain / snow / heavy winds... we're down to 50,000 locations already!

## Do they really recite the digits of pi? (Score:2, Interesting)

I ask because when I was a child, I remember reading about the "reciting digits of pi" record in the family

Guinness Book of Records. It had a photo of the then record-holder, standing in front of a chalk board, upon which was written "3.142857142857142857142857..."It's not hard to recite the decimal expansion of 22/7.

## Re:I live in Europe (Score:1, Interesting)

## Re:I live in Europe (Score:3, Interesting)

## Re: You forgot: european format is yyyy.mm.dd (Score:2, Interesting)

## Re:I live in Europe (Score:2, Interesting)

## Re:I live in Europe (Score:3, Interesting)

## Not really (Score:2, Interesting)

So lets sum from n=1 to infinity 1/b^n. Basic Calculus returns a value of 1/(b-1)

This is the probability that the partial digits of pi will be a pallindrome, for base 10, the probability is 1/9. Though it is almost certainly true for binary.

For the existence of a odd length Pallindrome, I exclude the trivial singleton of length one. So as from two to infinity. This comes out to 1/(b-1).