A043250 Numbers n such that 4 and 9 occur juxtaposed in the base 10 representation of n but not of n-1.

49, 94, 149, 194, 249, 294, 349, 394, 449, 490, 549, 594, 649, 694, 749, 794, 849, 894, 940, 994, 1049, 1094, 1149, 1194, 1249, 1294, 1349, 1394, 1449, 1490, 1549, 1594, 1649, 1694, 1749, 1794, 1849, 1894, 1940, 1994, 2049