Congruences for l-regular cubic partition pairs

Let b (n) denote the number of - regular cubic partition pairs of n. In this paper, we establish some infinite families of congruences of modulo 27 and 81 for b n). For example, for each a = 0 and n = 1, b9 3a+ 4n + 3a+ 4 - 2 = 0 mod 27), b9 27n + 25) = 0 mod 81).