112131domain: NAppears in sequencesa(n) = 19683*n - 5967.at n=5A157669Compositions of n into parts 3, 5 and 7.at n=56A245367a(n) = concatenation of all (i, e_i) with e_i > 0, when n = Product_{i >= 1} prime(i)^e_i.at n=29A299400Numbers whose digit product equals the number of their digits.at n=31A321771