Soldato
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Don't random number generators actually use the digits of pi? Or do random number generators actually exist where they don't have to use a string of numbers which it knows to be random.
The digits of pi aren't random in the slightest – they're completely determinate

Pseudo-random number generators work by using chaotic algorithms with arbitrary seed values. This provides statistical randomness, but ultimately can be predictable, which is why more secure methods are needed for cryptographic applications, for example.
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