173420

Appears in sequences

• Smallest number k such that among its first 2n divisors nonprimes and primes alternate, as {1, a prime, a nonprime, a prime, ...} up to the 2n-th smallest divisor of k.at n=4A227337
• Numbers m having greatest prime power divisor d such that d is smaller than the difference between m and the largest prime smaller than m and d is smaller than the difference between m and twice the largest prime smaller than m/2.at n=28A290290