79828domain: NAppears in sequencesNumber of 5-tuples of different integers from [ 1,n ] with no common factors among quadruples.at n=27A015644Number of 5-tuples of different integers from [ 2,n ] with no common factors among quadruples.at n=27A015645Numbers k such that k*Lucas(k) + 1 is prime.at n=34A134696