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Doctor Q

Administrator
Staff member
Sep 19, 2002
39,795
7,540
Los Angeles
Write the positive integers from 1 to 23 in sequence:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23​

Smoosh them all together:

1234567891011121314151617181920212223​

Remove the first 16 digits and the last 16 digits:

31415​

It's the first digits of pi in base 10! This is no doubt pi's most important mathematical property!
 

LizKat

macrumors 604
Aug 5, 2004
6,766
36,273
Catskill Mountains
I completely missed this novelty of 2015's Pi Day back when it happened. Gonna have to catch it when the universe brings that one around again on a different plane, maybe by then I'll have a better sense of what really matters.

Pi Day 2015 had extra special significance:​
On 3/14/15 at 9:26:53, the date and time together represented the first 10 digits of pi.​
 

chown33

Moderator
Staff member
Aug 9, 2009
10,751
8,425
A sea of green
Yesterday I baked a pie. This was quite unusual for me, because I'm not usually a cake-and-pie kind of baker. I'm more of a cookie baker, and usually bar cookies, but I do have some I make periodically that aren't bars.

Although I baked it on Pi Day, I haven't tasted it yet (I will later this evening). That's also unusual for me, because I generally taste-test new recipes right away.

So in this vein of unusualness, and keeping with the Pi Day theme, what did you do on Pi Day that was irrational or unusual?
 

LizKat

macrumors 604
Aug 5, 2004
6,766
36,273
Catskill Mountains
So in this vein of unusualness, and keeping with the Pi Day theme, what did you do on Pi Day that was irrational or unusual?

I got Spring-struck! I took the over-winter plastic off the inside of the upstairs windows on the east side of the house. Set about assassinating dust bunnies under the beds up there, switched out the flannel sheets for regular ones, put away the extra comforters, moved my T-shirts into the easy-access wire bins closest to hand in the closet.

And then... I found out it's going to be 12ºF tonight --yeah, the Ides of March-- and fixin' to snow by Tuesday and Wednesday. So in retrospect my behavior seems highly irrational.

But no matter, it's back up to 67º on Friday and by then it will seem irrational still to have storm windows on in the rooms downstairs.

The middle of March --or the Ides of March as it was called in Roman times-- was considered clearly perilous after Caesar had met his end at that time of year in 44BC.

According to Plutarch, a seer had warned that harm would come to Caesar no later than the Ides of March. On his way to the Theater of Pompey, where he would be assassinated, Caesar passed the seer and joked, "The Ides of March are come", implying that the prophecy had not been fulfilled, to which the seer replied "Aye, Caesar; but not gone."
Silly me, I figured all that stuff about bollixed plans at the Ides of March were a matter of dusty ol' Roman history. But now with this rollercoaster weather for a second straight year just before calendar Spring, I'm thinking to call it "The Wild Rides of March."

Maybe next year when Pi Day rolls around I'll develop a fat case of oppositional defiance and go for behaving in a rational manner regarding Spring prep: look but don't touch.
 

nrvous1

macrumors 68000
Jul 11, 2019
1,749
1,676
San Antonio, TX
Felt necessary.
 

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dannyyankou

macrumors G5
Mar 2, 2012
13,018
28,008
Westchester, NY
Let me see what I can do from memory…

3.141592653589794626

That’s all I can do now, if that’s even all right. I used to know a bit more.

Edit: I forgot the “3238” before the “4626”
 
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rubyscott

macrumors newbie
May 16, 2021
2
0
I recently read a whole paper from eduhelphub on the history of Pi. Even though the concept of Pi was popularized in 1706, but its application can be traced back to 2000 BC. ?
 

Doctor Q

Administrator
Staff member
Sep 19, 2002
39,795
7,540
Los Angeles
Knowing a few more digits can't hurt

Swiss researchers at the University of Applied Sciences Graubünden set out to use a supercomputer for a Pi Challenge, attempting to break the world record for the speed in calculating digits of pi.

They succeeded with flying colors. They computed pi to 62,831,853,071,750 (62.8 trillion) digits in 108 days and nine hours. That beats the previous world record speed (when computing 50 trillion digits) by about a factor of 3. (Sorry, not a factor of 3.14.)

In case you wondered, the 62,831,853,071,749th and 62,831,853,071,750th digits of pi are 64.

That's a bit more accuracy than when Archimedes computed pi to 2 digits.
 

Crowbot

macrumors 68000
May 29, 2018
1,706
3,920
NYC
It'll be interesting if someone can set the task to a quantum computer. 6.02x10^23 digits. ;)
 

Doctor Q

Administrator
Staff member
Sep 19, 2002
39,795
7,540
Los Angeles
A slightly modified poem by Joseph Shipley:

Ere a time I spent wandering in gloomy night;
The tower, tinkling chimewise, loftily opportune.
Out, up, and together came sudden to Sunday rite,
And one solemnly off to elegant afternoon.​

Count the letters in each word and what do you get? 3 1 4 1 5 9 ...

Puzzle: If the poem continued, how many letters would the word after "afternoon" have?
 
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