A085256 3-smooth numbers whose arithmetic derivatives are also 3-smooth.

2, 3, 4, 8, 9, 12, 16, 27, 54, 64, 81, 108, 144, 256, 432, 512, 729, 972, 1728, 2916, 3072, 3456, 4096, 6561, 11664, 19683, 20736, 23328, 27648, 65536, 78732, 139968, 157464, 186624, 262144, 442368, 531441, 944784, 1062882, 1259712, 1769472