Perfect Number Proof - Numberphile

672,745

10,593 0

Published 2015-01-06

This video follows on from: • Perfect Numbers and Mersenne Primes -...
More links & stuff in full description below ↓↓↓

Objectivity: youtube.com/c/objectivityvideos
Mersenne Primes and Perfect Numbers, featuring Matt Parker.

Matt is the author of Things to Make and Do in the Fourth Dimension. On Amazon US: bit.ly/Matt_4D_US Amazon UK: bit.ly/Matt_4D_UK Signed: bit.ly/Matt_Signed

Support us on Patreon: www.patreon.com/numberphile

NUMBERPHILE
Website: www.numberphile.com/
Numberphile on Facebook: www.facebook.com/numberphile
Numberphile tweets: twitter.com/numberphile
Subscribe: bit.ly/Numberphile_Sub

Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumberphile

Videos by Brady Haran

Brady's videos subreddit: www.reddit.com/r/BradyHaran/

Brady's latest videos across all channels: www.bradyharanblog.com/

Sign up for (occasional) emails: eepurl.com/YdjL9

Numberphile T-Shirts: teespring.com/stores/numberphile
Other merchandise: store.dftba.com/collections/numberphile

All Comments (21)

@TrackpadProductions 4 years ago

Is putting the lid on a pen the maths equivalent of dropping a mic, then?
@andrewxc1335 8 years ago

I differentiate between groups of operations not with inflection, but with pauses: "Two to the... n minus one," versus "two to the n... minus one."
@isaacechols2483 7 years ago

Matt becomes the child he talks about at 3:43, at 13:37
@MrDannyg77 8 years ago

Matt is great. I love his sense of humor. He's one of very few people who can take the subject of this video and make in entertaining to non-math nerds.
@BenTheBikerBoy 9 years ago

13:39 Literally the smuggest face ever :')
@AdamBomb5794 7 years ago

Classic Mathematician: "Let us assume that we know the total"
@LilAnnThrax 8 years ago

It's 2am. I've become addicted to watching Numberphile before bed. I'm watching towards the beginning where we are looking at the pattern of the 2, 4, 16, 64... And I think to myself, those are powers of 2. Then I see they are the prime -1. I figure Matt will say "this is obviously just 2 to the power of the prime minus one." When he says he tortures kids with it and it's not obvious at all I feel so happy that I finally understood a non obvious Numberphile concept. I finally feel like I belong. Loved this video!
@Formulka 9 years ago

"I use this to torment young people" :)
@jz5738 9 years ago

Oh that was beautiful; math truly is the music of logic!
@numberphile 9 years ago

Matt is the author of Things to Make and Do in the Fourth Dimension. You can support him by checking out his book... On Amazon US: bit.ly/Matt_4D_US Amazon UK: bit.ly/Matt_4D_UK Signed: bit.ly/Matt_Signed
@golux-57 5 years ago

Matt Parker, I would have loved to have you as a math professor in school. I've always loved math, and even majored in it as college. It was teachers like you who made it even more interesting.
@zacktobar13 9 years ago

It blows my mind how similar of a feeling this video gives me to watching my calc 2 professor do proofs for certain series tests...
@dragan176 9 years ago

You should do more of these proof videos, this was really great!
@olanmills64 2 years ago

For some reason, I find Brady's incredulity at the beginning to be hilarious."You've already shown a link!"
@GLRaema 9 years ago

Matt looks so happy at the end of this video :D
@jacobbaer785 7 years ago

Haha.. "that's why Australians are so good at math" 4:54
@nathanielmcclaflin1374 7 years ago

I love this channel! Matt has told me everything I needed to know about perfect numbers and mersenne primes in this video and his one that came right before it that I can teach it to my classmates that know nothing about it.
@isaac10231 9 years ago

I saw you on tv! Outrageous acts of science! Haha that's awesome.
@SpiderwebRob 9 years ago

Last two vids were really good. Keep it up Brady.
@dembro27 8 months ago

I think I would've gotten stuck at the geometric series step, but everything else was explained well and clicked for me. Cool!