Favorite prime number I'll start

1

:3c

91 :^)

>-1
>prime
i think im missing something here...

lol why would you have a favorite prime number hahaha freaking nerd

pic related

Not op but
My reasoning is that a prime is a whole number p that can only be factored as 1 * p
for example 7 = 1 * 7, 11 = 1 * 11,
now if we remove the restriction of whole numbers and use the integers we see that the only new number that can be written like this is -1.
-1 = 1 * -1 all other negative numbers can be factored as such -7 = -1 * 7
this may seem bad because of the following argument
7 = -1 * -7 so 7 isn't prime.
but remember
7 = (-1)^2 (1 * 7)
7 = 1 * 1 * 7

5040

(hint: anti prime)

-1 can't be a prime for the same reason 1 can't, you lose unique factorization, (-1)^3=-1. However, you should extend unique factorization to rational numbers so any positive rational number [math]q=\prod_{i\in\mathbb{N}}p^{m_i}[/math]
where [math]m_i\in\mathbb{Z}[/math]

well then if we take i as a factor couldnt that work as well?

why 7!?

2

units can't be primes brainlet

Units shouldn't be considered primes, -1 is a unit in the integers. Units being primes breaks unique prime factorization