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It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). I am aware that it is a special case of more general open problems.

But I'd like a concrete reference asserting that this specific problem is indeed open.

Edit: As I said, I'm not interested in more general conjectures. It's suitable for MO, because no one has given me a reference for this exact problem.

It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). I am aware that it is a special case of more general open problems.

But I'd like a concrete reference asserting that this specific problem is indeed open.

Edit: As I said, I'm not interested in more general conjectures. It's suitable for MO, because no one has given me a reference for this exact problem.

It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). I am aware that it is a special case of more general open problems.

But I'd like a concrete reference asserting that this specific problem is indeed open.

It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). I am aware that it is a special case of more general open problems.

But I'd like a concrete reference asserting that this specific problem is indeed open.

Edit: As I said, I'm not interested in more general conjectures. It's suitable for MO, because no one has given me a reference for this exact problem.

It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). But I'd like a reference.

It's a well-known open problem (Sophie-Germain primes) whether there are infinitely many primes $p$, $2p+1$. What about $p$, $2p-1$?

Seemingly it's also an open problem (see here and the linked question). I am aware that it is a special case of more general open problems.

But I'd like a concrete reference asserting that this specific problem is indeed open.