sentences:  For example, 5 is the smallest prime not dividing 6, so there is expected to be infinitely many AP-4 with common difference 6, which is called a sexy prime quadruplet.When "a" = 2, "p" = 3, it is the twin prime conjecture, with an "AP-2" of 2 primes ("b", "b" + 2).We minimize the last term.