• wischi
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      1 year ago

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

        • wischi
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          1 year ago

          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.

          • Kogasa
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            1 year ago

            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.

        • wischi
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          1 year ago

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