213393180domain: NAppears in sequencesFirst differences of sequence of primorials.at n=8A061720a(1)=1; for n > 0, a(n+1) = rad(a(n))*n where rad=A007947.at n=22A066332Numbers with exactly 8 distinct prime divisors {2,3,5,7,11,13,17,19}.at n=21A147575