A044756 Numbers n such that string 4,3 occurs in the base 10 representation of n but not of n+1.

43, 143, 243, 343, 439, 443, 543, 643, 743, 843, 943, 1043, 1143, 1243, 1343, 1439, 1443, 1543, 1643, 1743, 1843, 1943, 2043, 2143, 2243, 2343, 2439, 2443, 2543, 2643, 2743, 2843, 2943, 3043, 3143, 3243, 3343, 3439, 3443