31513125domain: NAppears in sequencesa(n) = (5*n+1) * (6*n+1)^(n-2) * 7^n.at n=4A251697Primordial LB numbers: LB numbers (A267856) that are not of the form 10*n where n is also an LB number.at n=15A268269If A327928(n) is zero, a(n) = A003415(n), otherwise a(n) = A327859(n) = A276086(A003415(n)).at n=79A328097