5500110domain: NAppears in sequencesNumbers k having exactly 6 distinct prime factors, the largest of which is greater than or equal to sqrt(k) (i.e., sqrt(k)-rough numbers with exactly 6 distinct prime factors).at n=9A115960p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S^3)^3.at n=29A291252