67850domain: NAppears in sequencesNumbers k such that 11*2^k - 1 is prime.at n=15A001772a(n) = ceiling(n*phi^17), where phi is the golden ratio, A001622.at n=19A004972Number of (w,x,y,z) with all terms in {1,...,n} and w > x < y >= z.at n=24A212501