22082967873domain: NAppears in sequencesThird convolution of the powers of 3 (A000244).at n=17A027472a(n) = n*3^n.at n=19A036290a(n) = (2n-1) * 3^(2n-1).at n=9A060851a(n) = 19*3^n.at n=19A176413Numbers with prime factorization of the form p_1^p_2*p_2^p_3*...p_(n-1)^p_n*p_n where p_(n-1) < p(n) and n > 1.at n=27A294110