A044750 Numbers n such that string 3,7 occurs in the base 10 representation of n but not of n+1.

37, 137, 237, 337, 379, 437, 537, 637, 737, 837, 937, 1037, 1137, 1237, 1337, 1379, 1437, 1537, 1637, 1737, 1837, 1937, 2037, 2137, 2237, 2337, 2379, 2437, 2537, 2637, 2737, 2837, 2937, 3037, 3137, 3237, 3337, 3379, 3437