357735

Appears in sequences

• Erroneous version of A062239, numbers n with property that every digit is a prime factor of n.at n=20A066483
• a(n) is the smallest composite k such that d(2)/d(1) + d(3)/d(2) + ... + d(q)/d(q-1) = prime(n), where d(1) < d(2) < ... < d(q) are the q divisors of k, or 0 if no such k exists.at n=17A260901