A061882 Smallest nontrivial number m such that first (leftmost) digit - second digit + third digit - fourth digit ... = n.

11, 10, 20, 30, 40, 50, 60, 70, 80, 90, 109, 209, 309, 409, 509, 609, 709, 809, 909, 10909, 20909, 30909, 40909, 50909, 60909, 70909, 80909, 90909, 1090909, 2090909, 3090909, 4090909, 5090909, 6090909, 7090909, 8090909, 9090909, 109090909