424320

Appears in sequences

• Smallest k such that d(phi(k)) - phi(d(k)) = -n, where d(k) = A000005(k) and phi(k) = A000010(k).at n=31A078151
• a(1) = 1, a(2) = 12, a(n) = smallest multiple of a(n-1) beginning with the least significant digit of a(n-1).at n=7A080495