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2021 isn't a prime number, it's something much worse: it's the product of two prime factors that are as large as they can be, so it takes as long as possible to find out it's not prime. I'm calling this class "fucker numbers"

@tomharris wait this means 2021 is a fucker number

@t54r4n1 yes!

@tomharris I like fucker number better.

@tomharris "As large as they can be" ??

@tomharris Were you doing this by hand?

@Ricardus in this case, yes. I now have "fucker-numbers.py" for larger ones

@tomharris should be called "anti-fucker numbers", since as you know, if you fuck around, you usually find out.

@tomharris Huh, neat! What's "as large as they can be"?

@h @tomharris Wow, that's close!

@tomharris hmm. . . should squares of prime numbers be included in this set?

@h the easiest formalisation says yes, but my instinct says no

@tomharris if not, then this would be any product of adjacent primes

@tomharris old term: RSA encryption. New term: cryptofuckery.

@tomharris oh wow. That’s a complicated relationship. Thanks for explaining.

sharpening my knife kupo@tomharris@mastodon.socialthe only place for a fucker number is if one comes up as my bib number in a race; I usually try to factor the number as I'm running and oxygen deprived. good if it's not too easy, takes my mind off things