204031domain: NAppears in sequencesIndices n == 1 (mod 9) such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.at n=17A117359Number of (w,x,y,z) with all terms in {0,...,n} and at least one of them is the range of {w,x,y,z}.at n=30A212746