You Need To Know About This Number

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Disclaimer: This video is for entertainment purposes only and should not be considered academic. Though all information is provided in good faith, no warranty of any kind, expressed or implied, is made with regards to the accuracy, validity, reliability, consistency, adequacy, or completeness of this information.

#math #brithemathguy #numbers

[BriTheMathGuy]

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[puzzlepuddles]

POV: you're messing with your calculator during math class

[ryanbell]

another interesting fact about 108 is that the numbers from lost (4, 8, 15, 16, 23, 42) add up to 108, which also happens to me the amount of time on the clock in the hatch controlling the electromagnetic bomb

[cecilofthesea]

343 is my favorite number. Back in high school I memorized all of the cubes of the numbers 1-10 for the heck of it, and for some reason the fact that 7 cubed was such a beautiful looking number stuck with me. Especially since I've always kind of hated multiples of 7 because there's no easy trick to identify if a number is divisible by 7 without just checking, unlike other single digit numbers which all have at least something that would give you an idea if they could possibly divide evenly into a number.

[glerpstudios]

Oh, and also:
13^2=169 and 31^2=961.
144 and 1444 are perfect squares, as are 576 and 5776.
Thanks for explaining these numbers - I'm a mathlete, so that 142857 rang a bell.

[fermata]

It hurts that I had to discover this for myself this year but I just had to share it...
The number 2021 is the product of two consecutive prime numbers (43*47). The last year whose number had this property was 1763 (41*43) and the next will be 2491 (47*53).
On that note, here's a friendly reminder that this year, we're just as far from 2017 as we are close to 2027, which also happen to be the two closest prime numbers to 2022. So I guess this year isn't all that boring!

[RGC_animation]

Fun Fact: The first number with no a single interesting property is (actually I forgot the number), but since it is the first number with no interesting property, that is a interesting property by itself.

[colbyscott]

As soon as 142857 popped up, I thought, "Hey look! It looks like 1/7!"
Also, for 6174, you said that should work with any four-digit number without repeating decimals, but it did not work for the first two. Under what conditions, then, does it work?

[Pacific_Grm]

I love how the eight is styled at 5:28 so it isn't horizontaly symmetrical

[aileenbuizon]

Also, you said 73 is a interesting number because of its mirroring and 73 mirror is 37, 37 is the 12th prime number right, now get this, 12's mirror is 21 and 21 is wait for it, a product of 7 and 3

[Fotoschiki]

I am being haunted by the number 225. Back when I learned programming in C in university (where you can't normally use characters that aren't part of the ascii table), I made a list with the code for some characters I might want to use more often. Like the german ß (an alternative for "ss"), because my name contains it. Guess what number I remembered? Right it's 225. That's when it all began.

Now I see it everywhere. in calculations, because 1.5² equals 2.25,
in trigonomitry, because 5/4 of pi is 225°, while 1/8th of pi is 22.5°,

I frequently look at random clocks, only to find out it's 2:25, 12:25, or any of the 22:50s.
Almost every time a timer runs down somewhere in my line of sight, you can bet I randomly look at it, exactly when there are 2 minutes and 25 seconds left.
The list goes on. I'm telling you, this number pops up everywhere!

[IloveRumania]

2:55 Something else I noticed:
7 × 2 = 14
7 × 4 = 28
(7 × 8) + 1 = 57
1/7 = 0.142857 (it repeats)
And here is 142857.

[agrimpuriya]

Who else discovered the 142857 themselves. You just have to play with the number 7 for some time to notice this.

[sergeytrasko]

Nice video! A lot of these interesting numbers poped up in Project Euler problems (e.g. cyclic numbers)

[Vitamortis.]

for the 142857 thing i discovered this a few months ago when working with x/7 fractions a bunch, its really cool.
also x/13 has two different sets of numbers that are used in the decimals (076923 and 384615). therefore I'm pretty sure that 076923 is the smallest (whatever that word is at 2:52) number

[laiyemoboys]

5:50
"Except for 998"
I think that's because the number 998, 001 already has a 998 in it.

[Weirdolo.]

I've never watched a math video in my entire life on youtube, yet this has been stuck in my recommended for 1 week, finally clicked on it and wasn't dissapointed!

[Guitar_Lab]

2:15 It's like I'm listening to Sheldon talking

[MrRubikraft]

You forgot most of the properties of 142857.
Split it in two, and sum the parts: 142 + 857 = 999
Split it in three, and sum the parts: 14 + 28 + 57 = 99
Square it, split it in two and sum the parts: 142857² = 20408122449, and 20408 + 122449 = 142857
How to easily remember this number? It's simply the decimal part of 1 / 7 (which is why 142857 * 7 =

[playfra]

2:55 1/7 = 0.142857, cool, isn't it?