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So
how many possible points can the seed start from? 1000?
10,000? A million?
Actually, it's 2 to 19937th power, which is slightly
larger than the number formed by the numeral 4 followed
by 6,000 zeroes.
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And
exactly how big a number is that?
It's hard
to get a feeling for the magnitude of hyper-large numbers
like that, because there's no real physical property to
attach to it. For instance, it can't compare to the number
of ounces the Earth weighs, as that number is a tiny, tiny,
tiny fraction of the number of possible seeds our RNG's
use.