92363domain: NPropertiesPrimalityPrimeyesAppears in sequencesExpansion of 1/((1-2*x)*(1-3*x+3*x^2)*(1-4*x+6*x^2-4*x^3)).at n=10A201458Number of (w,x,y,z) with all terms in {1,...,n} and w*x-y*z<n.at n=20A212108Prime numbersat n=8920