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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 2013-02-07 15:57:07

Leroy
Guest

Nth digit of pi

I've heard that there is a function that gives nth digit of pi,is it true?if it is i'd like to know more about it.

#2 2013-02-07 19:54:51

bobbym
Administrator

Online

Re: Nth digit of pi

Hi;

Yes, it is called a spigot algorithm. It can zero in on the nth digit without having to get all the preceding ones


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#3 2013-02-07 23:45:39

Leroy
Guest

Re: Nth digit of pi

Could you please tell me more about it

#4 2013-02-07 23:52:26

bobbym
Administrator

Online

Re: Nth digit of pi

Hi;

Here is an example of a spigot algorithm being used to get the 50 th digit from ln(2). Process is the same for pi.

http://www.mathisfunforum.com/viewtopic … 19#p229919

To see how pi is done check out the BBP formula right here.

http://en.wikipedia.org/wiki/Bailey-Bor … fe_formula


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#5 2013-02-08 01:28:08

Leroy
Guest

Re: Nth digit of pi

Thanks

#6 2013-02-08 02:13:04

bobbym
Administrator

Online

Re: Nth digit of pi

Hi;

Your welcome.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#7 2013-02-08 03:11:28

anonimnystefy
Real Member

Offline

Re: Nth digit of pi

Hi bobbym

Is there a way of getting the nth decimal digit of pi by a spigot algorithm?


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#8 2013-02-08 10:52:51

bobbym
Administrator

Online

Re: Nth digit of pi

Hi;

None that I know of, the BBP is for hexadecimal digits.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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