7149317941

Appears in sequences

• Write down all the prime divisors in previous term.at n=6A006919
• a(1) = 1; for n > 1, if a(n-1) is composite then a(n) is the concatenation of all the prime factors in order of a(n-1), otherwise a(n) is the smallest number not yet appearing in the sequence.at n=16A331603