30428domain: NAppears in sequencesSmallest number that requires n iterations of the bi-unitary totient function (A116550) to reach 1.at n=47A005424G.f. satisfies A(x) = 1 + x*A(x*A(x)).at n=10A087949Number of compositions of n into parts with distinct multiplicities and with exactly eight parts.at n=38A321778