34526135domain: NAppears in sequencesa(1)=1. a(n) = n*a(n-1) if n*a(n-1) has a fewer number of divisors than n+a(n-1) does. a(n) = n+a(n-1) if n*a(n-1) has a greater or equal number of divisors than n+a(n-1) does.at n=18A134190