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Just to find a large prime number....
Starting from 2, generate a set of subsequent numbers like this:
a1 = 2
a2 = a1 + 1
a3 = a1*a2 + 1
a4 = a1*a2*a3 + 1
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an = a1*...*a(n-1) + 1
This set of numbers should all be primes, but it doesn't contain all the prime numbers in order..
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