A077560 Second smallest integer of prime signature corresponding to that of A025487.

3, 9, 10, 27, 18, 81, 40, 42, 243, 100, 80, 84, 729, 108, 160, 168, 2187, 324, 252, 320, 330, 1000, 336, 6561, 800, 504, 640, 630, 648, 672, 19683, 1600, 1008, 1280, 1320, 1944, 1764, 1344, 59049, 1512, 3200, 1980, 10000, 2016, 2560, 2640, 5832, 2700