[BSEdlMMldESB]

except for the autistic crazy who just somehow knows

but I haven't seen that movie in many years, so I don't remember what he knows

but the actual test was 9 digits? (if i recall well)

I 'memorized' the first 31 primes! why? I'm not sure; but I know how I did it, I don't know what it means tho

[brmgb]

I think you are missing the point here. The only even prime is 2. The only prime ending with a 5 is 5.

The last digit of a prime bigger than 5 can only be 1, 3, 7 and 9.

[BSEdlMMldESB]

I'm looking for some point?

also, you're focused on base 10. And that 1,3,7,9 is the basis of the how i remember them: 11,13,17,19 then 23 AND ALSO 101,103,107,109, and then 113. but why!?

I learned that all twin primes in base 4 either end in 1 xor 3. and I know that all primes congruent to 1 modulo 4 can factorized into a complex number with its conjugate (Gaussian primes). But I don't understand this, I only 'know it'

And then, I figured that all the twin primes in base 6 are always end in 5 then in 1. and that's it, this is supposed to be a question by the way

[faraggi]

I recommend re-reading the OC and the replies.

[BSEdlMMldESB]

what is the OC? whose replies??

I think I gotta somehow get a better understanding of Mersenne and Eisenstein primes, but I don't like jumping through 'bureaucratic'-academic hoops to get things explained to me. it's only numbers, I have other things to do

[hurtigare]

What the original commenter dislikes is that a bunch of "brilliant" mathmaticians can't instantly recognize that any number ending with 2 or 5(except 2 and 5) can't be a prime.

I.e

999999999999995%5=0 999999999999992%2=0

Thus they are not prime numbers.

[tourist2d]

If number end in 2 or 5, is divisible by 2 or 5. So number ending in 2 or 5 cannot be prime. Math no hard to understand!

[BSEdlMMldESB]

but this is only because 10 in ten in decimal system

but the numbers are not (only) how they're written down!

meh...

[cwmoore]

I am not a mathematician or an actor, but if I played one in Hollywood movies I could certainly answer your questions, confidently and wrong. Interesting tangent, just off-topic.

https://mathworld.wolfram.com/GaussianPrime.html

[everybodyknows]

Not a down-voter of this, but author is missing the understanding that the set of primes is intrinsic to the integers and the definition of multiplication, and in not in any way dependent upon how integers are written on the page (or in the memory of a computer).