Comment by card_zero
16 hours ago
That particular one (twin primes) is one of a set of four, selected for being "unattackable" in 1912, and still unsolved.
16 hours ago
That particular one (twin primes) is one of a set of four, selected for being "unattackable" in 1912, and still unsolved.
As it happens, the problem the article is about (primes of the form n^2+1) is also one of that set of four (Landau's problems).