A043245 Numbers n such that 3 and 9 occur juxtaposed in the base 10 representation of n but not of n-1.

39, 93, 139, 193, 239, 293, 339, 390, 439, 493, 539, 593, 639, 693, 739, 793, 839, 893, 930, 993, 1039, 1093, 1139, 1193, 1239, 1293, 1339, 1390, 1439, 1493, 1539, 1593, 1639, 1693, 1739, 1793, 1839, 1893, 1930, 1993, 2039