493493domain: NAppears in sequencesSecond subdiagonal of triangle A027477, constructed from the Stirling numbers of the first kind.at n=10A027481Numbers n such that sigma(n)/phi(n) = 9/4.at n=10A164646a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 2, a(1) = 0, a(2) = 2, a(3) = 1.at n=29A295689