6019743744domain: NAppears in sequencesa(1) = 1, a(n) = smallest multiple of n divisible by the sum of all previous terms.at n=17A074179Euler totient function phi values of multiperfect numbers.at n=20A098203a(1)=1; for n>1, a(n) = a(n-1) + lcm(a(n-1),n).at n=16A135504