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

submitted 6 months ago by [email protected] to c/[email protected]

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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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[–] [email protected] 9 points 6 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)?

[–] [email protected] 46 points 6 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

[–] [email protected] 5 points 6 months ago

Ah gotcha! I thought it meant exclusively prime numbers

[–] [email protected] 2 points 6 months ago (1 children)

7+1

[–] [email protected] 15 points 6 months ago (1 children)

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

[–] [email protected] 1 points 6 months ago* (last edited 6 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 :)