A044111 Numbers n such that string 1,3 occurs in the base 6 representation of n but not of n-1.

9, 45, 54, 81, 117, 153, 189, 225, 261, 270, 297, 324, 369, 405, 441, 477, 486, 513, 549, 585, 621, 657, 693, 702, 729, 765, 801, 837, 873, 909, 918, 945, 981, 1017, 1053, 1089, 1125, 1134, 1161, 1197, 1233, 1269, 1305, 1341, 1350