Return to Question

If someone want to add something http://tea.mathoverflow.net/discussion/921/reedited/#Item_1

If someone want to add something http://mathoverflow.tqft.net/discussion/921/reedited/#Item_1

As one can see at MO Scribe's question Chen's Theorem with congruence conditions. it is the same like asking if there are infinitely many $k$ such that both $ak+1$ and $ak-1$ do not have any non-trivial factors of the form $\pm 1 \mod a$.

As one can see at MO Scribe's question Chen's Theorem with congruence conditions. it is the same like asking if there are infinitely many $k$ such that both $ak+1$ and $ak-1$ do not have any non-trivial factors of the form $\pm 1 \mod a$.

http://math.stackexchange.com/questions/15075/do-we-have-a-proof-of-the-infiniteness

https://math.stackexchange.com/questions/15075/do-we-have-a-proof-of-the-infiniteness