How many digits of Pi do you know?
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 The LuigiManiac
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How many digits of Pi do you know?
I was waiting to see if anyone else was going to kick off discussions here, but the lack of topics means that I will have to kick things off with a subpar idea. How many digits of Pi do you know off by heart?
Personally, I don't know very many (read: the first three digits) off by heart. I'm not the greatest at memorizing things.
EDIT:Apparently, someone posted another topic while I was getting this one made.
Personally, I don't know very many (read: the first three digits) off by heart. I'm not the greatest at memorizing things.
EDIT:Apparently, someone posted another topic while I was getting this one made.
Spoiler:
 gmalivuk
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3.14159265358979323846265338327950288419716939937510...
So, I guess, 50. I used to know quite a bit more, because I would change my university password to include the next ten digits every time I'd sufficiently memorized the 10 I was on.
But I suppose 50 isn't bad, since if I had to use it to compute the circumference of a circle as big as the galaxy, an exact knowledge of the radius would give me a figure off by only about 10^29 meters.
So, I guess, 50. I used to know quite a bit more, because I would change my university password to include the next ten digits every time I'd sufficiently memorized the 10 I was on.
But I suppose 50 isn't bad, since if I had to use it to compute the circumference of a circle as big as the galaxy, an exact knowledge of the radius would give me a figure off by only about 10^29 meters.
Last edited by gmalivuk on Tue May 01, 2007 9:50 pm UTC, edited 1 time in total.
 Torn Apart By Dingos
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3.14159265358
12 digits. I've known more, maybe three times that, which I memorized in a day, but those 12 have stuck.
I'm not so good at memorizing digit sequences. I don't use any tricks, such as pairing numbers (remembering "twelve" instead of "one, two"), I just say the digits in sequence quickly in my head. When I was younger, I thought such tricks would be cheating, and now I can't get out of the habit.
12 digits. I've known more, maybe three times that, which I memorized in a day, but those 12 have stuck.
I'm not so good at memorizing digit sequences. I don't use any tricks, such as pairing numbers (remembering "twelve" instead of "one, two"), I just say the digits in sequence quickly in my head. When I was younger, I thought such tricks would be cheating, and now I can't get out of the habit.
Last edited by Torn Apart By Dingos on Tue May 01, 2007 9:48 pm UTC, edited 1 time in total.
 cmacis
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Off the top of my head:
Pi pi mathematical pi
3.14159265358979323846264338327
and the rest is fuzzy
952088
That's about as many as the windows scientific calc. I may stop at 42 digits.
Pi pi mathematical pi
3.14159265358979323846264338327
and the rest is fuzzy
952088
That's about as many as the windows scientific calc. I may stop at 42 digits.
li te'o te'a vei pai pi'i ka'o ve'o su'i pa du li no
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
 warriorness
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I've stopped at 42 digits myself.
3. 1415 926 535 8979 323 8462 643 383 279 502 884 197169 or something like that. I broke up the groups in the way I memorized it (up to "8979" was on a poster in my elementary school math room).
3. 1415 926 535 8979 323 8462 643 383 279 502 884 197169 or something like that. I broke up the groups in the way I memorized it (up to "8979" was on a poster in my elementary school math room).
Iluvatar wrote:Love: Gimme the frickin' API.
yy2bggggs, on Fischer Random chess wrote:Hmmm.... I wonder how how a hypermodern approach would work
I remember reading an anecdote about Richard Feynman, and how he would try breaking into scientists' lockers with pi or e as the combination, with a pretty good success rate.gmalivuk wrote: I would change my university password to include the next ten digits every time I'd sufficiently memorized the 10 I was on.
 cmacis
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I now know what I'm typing for the postgrad's code for their own computer lab. It makes beeps when buttons are pressed, so I know there's 5 digits.
Yes, I was the kid who managed to get admin access at school.
Yes, I was the kid who managed to get admin access at school.
li te'o te'a vei pai pi'i ka'o ve'o su'i pa du li no
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.

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Pilike script
All this talk of PI reminds me of a program I once saw that I thought would make a great animated signature.
It was a clever hack. The program had the first 50 or so digits of PI stored, and slowly churned them out, merrily scrolling away, then, when it got to the end, it simply generated random digits and continued scrolling along giving the impression it was dynamically calculating the digits. A total con!
How many people know >50 digits of PI (present posters excluded), especially when they were scrolling by a couple a second. I wonder how many people it fooled?
It was a clever hack. The program had the first 50 or so digits of PI stored, and slowly churned them out, merrily scrolling away, then, when it got to the end, it simply generated random digits and continued scrolling along giving the impression it was dynamically calculating the digits. A total con!
How many people know >50 digits of PI (present posters excluded), especially when they were scrolling by a couple a second. I wonder how many people it fooled?
 cmacis
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I know people who can go that far. I think it's something that needs the run up though. If it is on a time delay then not many people would realise after so long.
li te'o te'a vei pai pi'i ka'o ve'o su'i pa du li no
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
5986764341518487643135168489461316516848479646164986
461643434346464643434616431313134613461361313486468748641641684616163443463434641918997673689499779794169494613
Since Pi is irrantional and never repeats; since eventually the string of numbers I present is unrepeating, they will in fact eventually be a part of Pi and thus are a part of Pi.
If you wanted us to knowingly submit digits of Pi which we recognized to be a known part of Pi you should have specified as such.
Edit: I am hammered. Discuss.
Acutally don't because that doesn't belong in this forum.
461643434346464643434616431313134613461361313486468748641641684616163443463434641918997673689499779794169494613
Since Pi is irrantional and never repeats; since eventually the string of numbers I present is unrepeating, they will in fact eventually be a part of Pi and thus are a part of Pi.
If you wanted us to knowingly submit digits of Pi which we recognized to be a known part of Pi you should have specified as such.
Edit: I am hammered. Discuss.
Acutally don't because that doesn't belong in this forum.
Meaux_Pas wrote:I do that too, but for an entirely different reason.RealGrouchy wrote:I still remember the time when Gordon left. I still wake up in the middle of the night crying and screaming his name.
RealGrouchy wrote:Our daughter is in high school now.Gordon wrote:How long have I been asleep?!
Gordon wrote:5986764341518487643135168489461316516848479646164986
461643434346464643434616431313134613461361313486468748641641684616163443463434641918997673689499779794169494613
Since Pi is irrantional and never repeats; since eventually the string of numbers I present is unrepeating, they will in fact eventually be a part of Pi and thus are a part of Pi.
This is not true.
For instance, the decimal 0.110100100010000100001000001.... is not repeating and hence irrational, but obviously doesn't even contain the substring '7'.
I do not know if pi has the property that any string of digits will appear, but it's far from certain.
 warriorness
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Re: Pilike script
GreatPokerHands wrote:All this talk of PI reminds me of a program I once saw that I thought would make a great animated signature.
It was a clever hack. The program had the first 50 or so digits of PI stored, and slowly churned them out, merrily scrolling away, then, when it got to the end, it simply generated random digits and continued scrolling along giving the impression it was dynamically calculating the digits. A total con!
How many people know >50 digits of PI (present posters excluded), especially when they were scrolling by a couple a second. I wonder how many people it fooled?
There exist algorithms that calculate pi's digits extremely rapidly, much faster than linear time (which would be the minimum required for such an image). Why not just use those to calculate actual digits?
Hmm. Because that would require extremely accurate floatingpoint computation and a hell of a lot of RAM to store the digits. I'll post this anyway; it's an interesting thought.
Iluvatar wrote:Love: Gimme the frickin' API.
yy2bggggs, on Fischer Random chess wrote:Hmmm.... I wonder how how a hypermodern approach would work
 skeptical scientist
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 cmacis
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We have an e page, and phi can be expressed exactly as 1/2(1+sqrt(5)). Off the top of my head: 1.61.
li te'o te'a vei pai pi'i ka'o ve'o su'i pa du li no
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
Mathematician is a function mapping tea onto theorems. Sadly this function is irreversible.
QED is Latin for small empty box.
Ceci nâ€™est pas une [s]pipe[/s] signature.
 You, sir, name?
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 gmalivuk
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Dingbats wrote:3.1415926535897932384626433
25 decminals, 26 digits. I could recite those in sleep.
Again (like with people who remember 2.71 for e), why do you stop at a point where the next digit is 8, and therefore your truncation has a much larger rounding error than necessary.
Edit: Remembering 1.61 as an approximation for 1.618 is similarly problematic.
Why can't people seem to remember 8s?
gmalivuk wrote:Dingbats wrote:3.1415926535897932384626433
25 decminals, 26 digits. I could recite those in sleep.
Again (like with people who remember 2.71 for e), why do you stop at a point where the next digit is 8, and therefore your truncation has a much larger rounding error than necessary.
I didn't know the next digit was 8, naturally. Now I know, thanks. 3.14159265358979323846264338. Damn, stopping there feels unnatural, I need four more digits to make it 30.
EDIT: 3.141592653589793238462643383279 it is.
I know 53  which is EXACTLY the same number as the first person to respond to this thread. I was spooked by this and had to join the forums as a result.
I group them like this:
3.  141  59  26  5358  979  323  84  626  43383  2795  0288  419716  93993  7510  58
It makes them easier to remember.
Phi: 1.618033989 = 10 digits (but the last is really an 8, rounded up)
e: 2.718281828459045 = 16 digits
I group them like this:
3.  141  59  26  5358  979  323  84  626  43383  2795  0288  419716  93993  7510  58
It makes them easier to remember.
Phi: 1.618033989 = 10 digits (but the last is really an 8, rounded up)
e: 2.718281828459045 = 16 digits
++$_ wrote:I know 53  which is EXACTLY the same number as the first person to respond to this thread. I was spooked by this and had to join the forums as a result.
[snip]
e: 2.718281828459045 = 16 digits
Same there. Look at the e thread...
(You've got me by a longshot on phi though. I just know 1.618. I can give you the exact speed of light in meters per second though. )
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