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xkcd #2922: Pub Trivia (imgs.xkcd.com)

submitted 4 months ago by randomaccount43543@lemmy.world to c/xkcd@lemmy.world

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https://xkcd.com/2922

Alt text:

Bonus question: Where is London located? (a) The British Isles (b) Great Britain and Northern Ireland (c) The UK (d) Europe (or 'the EU') (e) Greater London

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[–] j4yt33@feddit.de 9 points 4 months ago (2 children)

8 (about Goldbachs conjecture) is one that I don't quite get. Isn't the number 8 already proof that this isn't true (sum of 4+4)?

[–] MarcomachtKuchen@feddit.de 46 points 4 months ago (1 children)

8 is the sum of 5+3 both of which are primes. I think the Conjecture just states that there is a sum of two primes not every sum consists only of primes

[–] j4yt33@feddit.de 5 points 4 months ago

Ah gotcha! I thought it meant exclusively prime numbers

[–] hushable@lemmy.world 2 points 4 months ago (1 children)

7+1

[–] cori@lemmy.blahaj.zone 15 points 4 months ago (1 children)

1 is not a prime number. It would have to be 3+5

[–] Ardyssian@sh.itjust.works 1 points 4 months ago* (last edited 4 months ago)

~~Then wouldn't 4 fail the conjecture? 4 = 1+ 3 but 1 is not a prime.~~

Nevermind my sleepy self somehow thought 2 isn't a prime number :)