746503065domain: NAppears in sequencesa(n) = (5n+2)*C(n) where C(n) = Catalan numbers (A000108).at n=15A053368Bi-unitary highly composite deficient numbers: bi-unitary deficient numbers k whose number of bi-unitary divisors bd(k) > bd(m) for all bi-unitary deficient numbers m < k.at n=15A302936