571427domain: NAppears in sequencesMinimum number k for which the digital sum of k*n is 8*n.at n=7A147828a(n) is the number of positive integers k for which Sum_{i=1..r} p_i = Sum_{i=1..r} e_i = n, where p_1^e_1*...*p_r^e_r is the canonical prime factorization of k.at n=43A390784