Comment by Whirlybird@aussie.zone on Primes

2 is a prime number though……

Is it Just because it’s the only even one?

Often things hold true for all primes except 2. You come across things like “for all non two primes”

Any examples? Sounds like you mean the reason why one is excluded from the primes because of the fundamental theorem of arithmetic.

No, he’s right. “For any odd prime” is a not-unheard-of expression. It is usually to rule out 2 as a trivial case which may need to be handled separately.

https://en.wikipedia.org/wiki/Fermat's_theorem_on_sums_of_two_squares

https://www.jstor.org/stable/2047029

https://www.jstor.org/stable/2374361

It’s not unheard of no, but if you have to rule out two for some reason it’s because of some other arbitrary choice. In the first instance (haven’t yet looked at the second and third one) it has to do with the fact that a sum of “two” was chosen arbitrary. You can come up with other things that requires you to exclude primes up to five.

Okay? Like I said, it’s usually to rule out cases where 2 is a trivial edge case. It’s common enough that “for any odd prime / let p be an odd prime” is a normal expression. That’s all.

I just remember it from numberphile, I don’t remember what videos sorry.

Wow that was fast I just edited my previous comment and you probably mean “1 and prime numbers” by numberphile with james grime.

Like what? Genuine question, have never heard of this.

In the drawer in the living room in the house in my town in my state in my country.

And how is “even” special? Two is the only prime that’s divisible by two but three is also the only prime divisible by three.

Well 2 is the outlier because it’s the only even prime. It might not be “special” but it is unique out of all of the prime numbers.

“even” just means divisible by two. So it’s not unique at all. Two is the only prime that’s ~~even~~ divisible by two and three is the only prime that’s divisible by three. You just think two is a special prime because there is a word for “divisible by two” but the prime two isn’t any more special or unique in any meaningful way than any other prime.

It’s unique because all the others are odd numbers. This is crazy that you’re trying to argue this.

Of couse all the others are odd because otherwise they wouldn’t be prime. All primes after three are also not divisible by three… “magic”. The only difference is that there are is no word like “even” or “odd” for “divisible by three” or “not divisible by three”.

only difference is that there are is no word like “even” or “odd” for “divisible by three” or “not divisible by three”.

Yep, hence why 2 is unique - there is a word to describe numbers that are divisible by 2, and 2 is the only one of those that is a prime number.

It seems that you don’t know what the word “unique” means.

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