Cf. A003618 (largest n-digit prime), A340222 (same with semiprimes), A340207 (same for squares, limit of A339978), A340209 (same for cubes, limit of A340115), A340219 (similar for smallest n-digit primes, limit of A215641), A340221 (similar , with smallest semiprime, limit of A215647), A340206 (similar , with smallest n-digit squares, limit of A215689), A340208 (similar , with smallest n-digit cubes, limit of A215692), A340220 (same for primes, limit of A338968).