191 is a number n for which n, n+2, n+6, and n+8 are all prime
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(1)+(2) Given that n is a prime number greater than 191 so n is odd and ... of them must be a multiple of 4, so (n-1)(n+1) is divisible by 2*4=8. ... n^2 -1 = (6n+1)^2 - 1 or n^2 -1 = (6n - 1)^2 - 1
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