420750domain: NAppears in sequencesIrregular triangle with 4 columns which contains in each row the members of a 4-cycle under the map x->A063919(x), iteration of summing the proper-unitary divisors.at n=7A098188a(n) = reverse(2^n) mod 2^n.at n=20A103166Unitary sociable numbers of order 4.at n=7A319902