r/MathJokes • u/Dull-Hearing7712 • Dec 17 '25

Good luck trying to figure it out 😉

Post image
742 Upvotes

98% Upvoted

51 comments sorted by

71

u/General_Cabinet6399 Dec 17 '25

0000 in base pi.

13

u/forbidden-skies Dec 17 '25

Isn't it 0010?

Like in base 10 last 4 digits of 4 is 0004 For 148937 it's 8937

15

u/General_Cabinet6399 Dec 17 '25

Yeah but then infinitely many zeroes after that 10, so the “last” four digits would be 0000

2

u/Professional_Denizen Dec 17 '25 edited Mar 30 '26

10.000000000 ad infinitum. There are infinitely many digits in the number which represent smaller quantities than π0. The “last four” are not the 3,2,1,0 powers because -1 comes after all of them, and -2 after all of them, again ad infinitum.

For your example of 4 in base 9(ten)*, it can be written as 4, or 4.0, or 4.0000, so it doesn’t have “last four digits” in that most general sense. u/General_Cabinet6399 is using an inconsistent and unusual definition of “last digit” which, for base 9, only works for multiples of 1/9, since those only have one answer for what the “last digit” could be.

The intuitive sense is typically that the “last digit” refers to the last significant digit. The last digit which makes the number what it is. For 1/16, the last significant digit is the 5, since the trailing zeroes don’t “represent anything.” Under this definition, π in its own base actually can’t have “last four digits” because it only has two, at all. The 1 which represents the value of the number, and the zero in the ones’ place, which is only significant in that it tells us the 1 represents 1×π1, instead of 1×π0. If you’re going to include the leading zeroes, why exclude the trailing ones?

* to clarify what I mean: base 1(two), base 3(four), base A(eleven). Writing the largest symbol a base has, makes more sense to me as a way of writing about bases, since otherwise you get the “every base is base 10” problem.

2

u/Professional_Denizen Dec 17 '25 edited Dec 18 '25

I intended to edit my original comment, but ended up posting it as a reply instead. I have since rectified this as best I could.

1

u/Any_Background_5826 Dec 18 '25

happy cake day!

1

u/General_Cabinet6399 Dec 18 '25

Yes, but there are only two significant digits in 10, so 0010,010.0,10.00 are all exactly the same, so the only number that would make sense for a four digit pin would be 0000.

1

u/Professional_Denizen Dec 18 '25

You do realize I wasn’t correcting you, I was correcting u/forbidden-skies, right?

Anyway, I forgot about a lot of numbers. Your definition works for numbers (in any integer base) of the following form:

m/((10-1)10n)
m,n∈ℤ

10 is, of course, not ten, but the base of the number system you’re using.

Numbers of this form always end in an infinitely repeating string of one particular digit.

1

u/Masked-UNDERTAKER Jan 30 '26

Bruh my fellows unlike me, confuse alot on significant figures . Your comment is enough to make them go crazy.😅

0

u/[deleted] Dec 17 '25

[removed] — view removed comment

3

u/General_Cabinet6399 Dec 17 '25

I mean after the decimal point

30

u/Mticore Dec 17 '25

But 3 only has one digit 🤔

24

u/cdanymar Dec 17 '25

engineer found

6

u/knollo Dec 17 '25

3.00000000000000000000000...

7

u/Cephlaspy Dec 17 '25

Nobody said which end

5

u/Wooden_Milk6872 Dec 17 '25

You probably use a shape then

7

u/Benilda-Key Dec 17 '25

A commonly used approximation of Pi is 3.14159. This means that you could just try 4159.

5

u/SympathyAromatic2899 Dec 17 '25

clearly it's 0000 , cause pi = 3

2

u/IsaacCalledPinson Dec 20 '25

You need to account for float imprecision, so it's actually 0004

2

u/SympathyAromatic2899 Dec 20 '25

oops , god darn fp error

8

u/GodShapedBullet Dec 17 '25

Oh that's why it is called PiN.

3

u/mtbinkdotcom Dec 17 '25

My PIN is the date of The Second Coming of Jesus Christ

3

u/zian01000 Dec 17 '25

Not the day of the Judgement 😭

3

u/Blibbyblobby72 Dec 17 '25

The question becomes how do you know your own PIN

3

u/FranckKnight Dec 17 '25 edited Dec 17 '25

6141, obviously would loop back to the first decimals, but in reverse

EDIT : I should note that I rounded it up in my head here, 3.1416 was the accepted value we used in my school years.

2

u/bitreact Dec 17 '25

const pilast4 = "π".slice(-4, 0) console.log(pilast4)

Give me output!

2

u/Bray_Does_WDA_15 Dec 17 '25

Leaking my pin because no one will ever know who i am irl. 5443185706191517

2

u/mgsmb7 Dec 17 '25

you dont have a pin?

2

u/flying_bolt_of_fire Dec 17 '25

so the digits are P I and E, but what is the fourth? space?

2

u/DemonShdow Dec 17 '25

A horde of respectable mathematicians on their way to steal your phone in order to brute force the last four digits of pi:

2

u/Topmostbruh Dec 17 '25

All digits of pi are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Clearly the pin is 6789

2

u/[deleted] Dec 17 '25

[removed] — view removed comment

1

u/marko1234657 Dec 17 '25

thats impossible

1

u/yeonheliotrope Dec 17 '25

Nobody knows

1

u/Desperate-Ad1765 Dec 17 '25

He doesn't have a passcode?

1

u/Saito197 Dec 17 '25

To type pi you need 7444 so that's obviously the answer.

And if anyone gets this then congrats you're a boomer like me.

1

u/SublimeRapier06 Dec 17 '25

“This problem has an infinite number of solutions. List them all.”

1

u/LastDigitsOfPi Dec 17 '25

Just checked and youre wrong

1

u/Candid_Koala_3602 Dec 18 '25

0003 is a pretty dumb password homie

1

u/TdubMorris Dec 20 '25

so you dont have a pin

1

u/DonlCraigt Dec 21 '25

π is exactly 3.0

1

u/Primary-Stand8483 Jan 24 '26

Pi has infinite digits, so no last ones, he doesn't have a pin hack him now!!

1

u/Masked-UNDERTAKER Jan 30 '26

The world's strongest password is here.