Am I me or my evil twin?

Let p p and q q be twin primes larger than 3 where q > p q > p . Can one find a number n n such that:

p = 6 n + 5 p = 6n + 5 and

q = 6 n + 7 q = 6n + 7

Yes, sometimes Yes, always No, never

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2 solutions

João Areias
Nov 22, 2017

Since p p and q q are twin primes, and q > p q > p , q = p + 2 q = p+2 . Considering p 1 ( m o d 3 ) p \equiv 1 \pmod 3 would imply that q 0 ( m o d 3 ) q \equiv 0 \pmod 3 or 3 p 3 | p which is a contradiction since q q is prime. Considering p 2 ( m o d 3 ) p \equiv 2 \pmod 3 would imply that q 1 ( m o d 3 ) q \equiv 1 \pmod 3 and thus is the only option for p p and q q to be twin primes.

Since p 2 ( m o d 3 ) p \equiv 2 \pmod 3 and p 1 ( m o d 2 ) p \equiv 1 \pmod 2 we can easily deduce from the chinese remainder theorem that p = 6 n + 5 p = 6n + 5 , since q = p + 2 q = p+2 , q = 6 n + 7 q = 6n + 7

Saksham Jain
Nov 22, 2017

n=1 is a solution

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