633160domain: NAppears in sequencesa(n) = prime(prime(prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1) - 1) - 1.at n=11A141130a(n) = f(f(f(f(f(n))))), where f(n) is prime(n)-1.at n=30A141139