313849599domain: NAppears in sequencesIf a(n) is prime, a(n+1) = a(n) followed by a 1; if a(n) is composite, a(n+1) = concatenation of prime factors of a(n) (with multiplicity).at n=10A049121If a(n) is prime, a(n+1) = a(n) followed by a 1; if a(n) is composite, a(n+1) = concatenation of distinct prime factors of a(n).at n=10A055657