Abstract. Let x 0 < x 1 < x 2 < · · · be an increasing sequence of positive integers given by the formula x n = βx n−1 + γ for n = 1, 2, 3, . . . , where β > 1 and γ are real numbers and x 0 is a positive integer. We describe the conditions on integers b d , . . . , b 0 , not all zero, and on a real number β > 1 under which the sequence of integers w n = b d x n+d + · · · + b 0 x n , n = 0, 1, 2, . . . , is bounded by a constant independent of n. The conditions under which this sequence can be ultimately periodic are also described. Finally, we prove a lower bound on the complexity function of the sequence qx n+1