It was a guy called B. Nicolò I. Paganini, not to be confused with the violinist of the same name.

hmm nice the video is 220 seconds long... now where's the hidden 284?

In my history of mathematics class, I had the following problem about amicable numbers and I thought I’d share it. Prove that if p is prime, neither p nor p^2 can be part of an amicable pair. Proof: Let s(n) be the sum of proper divisors function. s(p) = 1 However, since 1 has no proper divisors, then s(1) cannot be p. s(p^2) = p+1 s(p+1) ≤ 1+2+3+...+p = p(p+1)/2 1

@TheSingingNerd Same here. I first heard of them reading a book called "The HouseKeeper and the Professor" long after graduating. Now I see why they're not taught in college though. They seem to be too rare to have any obvious practical use.

That was such a good video. Math lesson and deep thoughts all in one? Yes plz.

The jewelry at the end was really sweet

I wonder if there is an infinite number of amicable numbers. If so I would presume the proof of such would be quite difficult. Any thoughts?

NIce necklaces! And nice video!

No, I should ask, because they made about 18 videos. But they did it all in one day, so maybe something didn't work out. I'll send you some other videos from David.

Loved the vid, took a replay to get it, but I think I'm there now =) Peace

James, are you coming onto us?

simplify the following equation: 9x-7i > 3(3x-7u)

@lengthy2712

2 жыл бұрын

i

I watched it again. haha this is more meaningful to me than it should be :D

And THAT is something new I've learnt today :) .. And something very interesting

Interesting video!

thanks, we have not seen a video from you in a while :-)

I love it when you talk mathy ;)

cool i like how u combined math and valentines day

@HoorayBier I should probably correct that. Galois coined it group theory, Euler developed it.

Great Thought!!!!!!!!!!

Haha! It' a good question though, I don't know!

by the way, do you know what ever happened to undunc? I took an Uncertaintly Analysis course with NASA, and the videos he put out were actually pretty useful.

Nice :)

brilliant.

great question

I don't think math is so interesting sometimes but YOU make it interesting...

it's videos like this that make me wish you were my maths teacher.

see i can learnn maths and history from this in 3 minutes instead of learnin them in school for an hour

you rock

Are there 3 numbers A, B and C such that proper divisors of A add up B, proper divisors of B add up C and proper divisors of C add up A...? (yes, it's a complicated relationship I'm in)

Happy V-day'z to you too.

@Blackcat008 They're called "sociable numbers"

@shikamarusgirl17 I figured it was Gauss, but Gauss's name wasn't mentioned.

Are there infinitely many of them?

which should of course be written as 3u>i

And then you go: i and you'd you: i

well, no, but 144 + 24y + y^2 is. this pattern is known as the trinomial square

woot!

21u>7i right?

@Makaraka222 I WAS THINKING THE SAME THING!

Nice

A Cambridge professor quoting Huey Lewis and the News? My gosh, the world is broken.

huey lewis is the man, nice reference

nice chain

bravo

lol, i wonder who the other half of the 220 or 284 hearts belongs to

2:12 ITS OVER 9,000,000!!!!!

its valentines day 2011!

I'm more of a 6

Are you sure you don't mean 153?

You can resort to numbers for any situation, can't ya?

@MrStuckyJ i am I missing something?

Oh, ok, i

3u > i ???

its sad i understand all your videos but i cant pass algebra 1 part 1......

You can check the list of amicable numbers using the given programming code as shown below: #include int sigma(int n,int i,int a, int b,int sum) { sum=0; for(i=1;i

Is it ironic that the 284 who founded what he studies (Group Theory) died in a duel over the love of a 220?

@deepfiligree I had it made.

777 views with 77 ratings...!

@ablokenamedbob don't you get it? i i

144 + 24y + y^2 = (y + 12)(y + 12)

ur like a relationship doctor or something