What is the mathematical formula to generate a random number?

What is the mathematical formula to generate a random number?

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eval(X) where X is a random variable

how do you precisely define "random variable"

en.wikipedia.org/wiki/Random_variable#Definition

Fucking high schoolers

But you still can't actually generate randomness?

Do you have to have something random in the first place in order to produce something random?

You don't even understand your own question. Give me the formal definition of randomness that you're working under.

True randomness doesn't exist faggot

I can't really give a formal definition that's why I'm asking.
Informally what I mean is something which has no causal relationship with its generator.

>quantum physics

Then we don't know if it even exists. Quantum phenomena appear random but we don't know for certain. There certainly isn't a formula for it. That would obviously violate your definition. But for practical purposes, pseudorandom generators are usually fine.