56095domain: NAppears in sequencesa(n) = ceiling(n*phi^19), where phi is the golden ratio, A001622.at n=6A004974Initial number for record sum of numbers in trajectory of 3x+1 problem.at n=38A033495Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={1,4}.at n=23A079961