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The product of consecutive primes from 2 to any prime plus 1 is a prime.
For example:
1) 2 + 1 = 3
2) 2 x 3 + 1 = 7
3) 2 x 3 x 5+1 = 31
4) 2 x 3 x 5 x 7 +1 = 211
. . and so on...
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