A044039 Numbers n such that 7 and 9 occur juxtaposed in the base 10 representation of n but not of n+1.

79, 97, 179, 197, 279, 297, 379, 397, 479, 497, 579, 597, 679, 697, 779, 799, 879, 897, 979, 997, 1079, 1097, 1179, 1197, 1279, 1297, 1379, 1397, 1479, 1497, 1579, 1597, 1679, 1697, 1779, 1799, 1879, 1897, 1979, 1997, 2079