1593000domain: NAppears in sequencesMaximum number of odd 2 X 2 submatrices over all 2n X 2n (0,1) matrices.at n=29A093699Numbers with at least three 3s in their prime signature.at n=30A176359Numbers that have exactly three exponents in their prime factorization that are equal to 3.at n=30A386802