37732domain: NAppears in sequencesNumbers n such that 173*2^n-1 is prime.at n=28A050838a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 4, a(1) = 3, a(2) = 2, a(3) = 1.at n=22A295673Numbers k such that the arithmetic mean of the first k squarefree numbers is an integer.at n=7A355544