4 𝙢𝙞𝙣𝙪𝙩𝙚𝙨 𝙤𝙛 𝙄𝙉𝙏𝙀𝙍𝙀𝙎𝙏𝙄𝙉𝙂 𝙈𝘼𝙏𝙃

Math can be interesting.

[bnb-gnuo]

Bro it really is a shame how the algorithm treats u, ur channel is like the perfect medium length math style video that's informative but beginner friendly, genuinely feels like watching a baby 3 blue1brown. Even if youtube views are discouraging sometimes I hope u keep it up out of passion bc this channel is very interesting and a great addition to youtube

[goldenwarrior]

Fun fact: the median of the first n odd numbers is always n

[lukejones]

Here’s a few things I discovered myself.
Take a number and reverse it, then subtract them and the result is always a multiple of 9. For example, 83-38 is 45. This is true for all numbers. If we are talking about single digit numbers assume that there is a 0 in front. For example 9-90 is -81.
If you take a number and subtract the sum of its digits, it will also be a multiple of 9. Let’s take 83 again, 8+3 is 11, 83-11 is 72, which is a multiple of 9.
If you put a 0 anywhere in a number, and subtract the original from it, it will always be a multiple of 9 too. Let’s use 83 again, and put a 0 in the middle. 803-83 is 720, which is a multiple of 9.
9 is an interesting number, and no, I did not find any of this online I thought of it myself.

[Nartymer]

1:20 that actually holds true for a reason.

when you want to go from n^2 to (n+1)^2, you're basically adding 2n+1. Why?

n^2 + n = n(n+1)

n(n+1) + (n+1) = (n+1)(n+1) = (n+1)^2

you added 2n+1 to transform n^2 into (n+1)^2. Basically every time you add the next odd number to the ongoing sum, you're also adding +1 to n in n^2.

I think you can apply a similar logic to the next 2 facts in your video. Interesting math indeed my friend

[musicofficial]

Reason is area of square is a×a and addition of numbers form the product of lenght and bredth of rectangle formed after addition❤

[matveytsarichansky]

3:01 you can just say you always get a number thats divisible by 9 so there are no edge cases for example when you got 27 instead of showing that it adds up to 9 eventually you can just say its divisible by 9(which is basically the same) and now you dont have the edge case of same digits numbers because 0 is divisible by 9.

[xyygsek]

the last one isn't really that impressive because, i'm not 100% certain, but i'm pretty sure that 4 would be the only number (in english) with the property of having the same letters as its value, so its the only one that would "trap" you on a loop, plus the bigger the number the bigger the difference between its value and its number of letters so it will always reduce up to single digit letters and 4 out of ten (almost half) of the single digit numbers have four letters so it's most likely not going to take too long to get to 4

great video tho! the first fact really blew my mind

[FebruaryHasDays]

Here's a list of languages that spell four letters for the number four.
Bisaya: upat
English: four
Filipino: apat
German: vier
Norwegian: fire
Can you think of more?

[Hosib-sthd]

I'm surprised that everything doesn't equal 42

[kazisafeerzayan]

Ahhh yes. Everything is 4. Even this video’s length.😂😂

[vadlocksvadlearn]

These facts are easy to prove, but it's really beautiful

[_Doctor_]

I discovered a similar interesting fact in math. Take a random number x. Add the same number. From the result, subtract the number x. Multiply the new result with x and divide the result with x. At the end you get the xth odd number.
The operation is like this:
[(x+x)x-x]/x
Example:
[(3+3)3-3]/3= (6*3-3)/3=(18-3)/3=15/3=5 which is the 3rd odd number.

[Woah]

An intresing fun fact that i found
Let f(x) be a n degree polynomial such way f(0)=0, f(1)=1 f(2)=1, ...., f(n)=(n-1)th fibonaci number then f(n+1) will always be equal to 0

[kfvmokp]

First Happy Numbers: 1, 7, 10, 13, 19, 23, 28, 31, 32, 44. As you can see a lot of the happy numbers are prime numbers.

[musicofficial]

3, 6, 9 are the most mysterious numbers I already know about these subtration because 0 represent singularity and 9 universe

[kashmirandal]

4:10 I actually made my brother insane with this a few months ago. He tried everything, even decimals, He tried numbers that would take hundreds of letters. But, still, it didn't take long to get to 4.

If you have a really, really big number, you should expect it to only have a few hundred letters. In that case, it could easily condense into 4. Even numbers that take millions of letters to spell are under this spell (pun intended) because any number from 1 million - 999 m are easy to spell.

[fmlpa]

Hey! Where's Terrence Howard????..lmao...❤❤❤

[ClassicSphere]

Bro, How did you bolded and italicited video text

[orisphera]

3:00 I think this is wrong: if we take 2762 and subtract itself with the first and last digits swapped, we won't get 9 after doing that, either

[orisphera]

4:00 I once did a similar thing and got двадцатиоднобуквенный. I did that after seeing двадцатичетырёхбуквенный somewhere