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.

A227337

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.