Search a number
practical n.  and  unprimeable n.

First numbers that belong to both sets:

200, 204, 208, 320, 324, 510, 512, 532, 620, 624, 840, 896, 1134, 1140, 1144, 1148, 1260, 1332, 1344, 1350, 1352, 1410, 1416, 1464, 1500, 1504, 1640, 1672, 1674, 1680, 1710, 1716, 1760, 1764, 1768, 1792, 1794, 1856, 1890, 1920, 1960, 1968, 2040, 2046, 2048, 2070, 2072, 2100, 2106, 2184, 2190, 2196, 2320, 2322, 2360, 2368, 2400, 2408, 2480, 2484, 2496, 2560, 2562, 2580, 2820, 2940, 2944, 2982, 2988, 3096, 3150, 3234, 3240, 3248, 3264, 3280, 3420, 3472, 3480, 3486, 3500, 3504, 3560, 3564, 3660, 3666, 3680, 3740, 3744, 3750, 3752, 3780, 3784, 3816, 3894, 3952, 3976, 3978, 3990, 3996, 4032, 4060, 4080, 4088, 4100, 4104, 4140, 4144, 4160, 4180, 4300, 4312, 4380, 4410, 4416, 4472, 4536, 4554, 4576, 4680, 4686, 4740, 4760, 4770, 4824, 4840, 4848, 4896, 4920, 4928, 5040, 5060, 5120, 5124, 5130, 5136, 5214, 5244, 5248, 5250, 5256, 5310, 5312, 5360, 5368, 5376, 5424, 5454, 5456, 5460, 5490, 5544, 5600, 5610, 5616, 5670, 5676, 5720, 5724, 5760, 5768, 5916, 5940, 5964, 5976, 5992, 5994, 6180, 6188, 6400, 6402, 6408, 6432, 6500, 6510, 6512, 6534, 6624, 6640, 6642, 6720, 6750, 6816, 6930, 6936, 7080, 7084, 7098, 7110, 7140, 7168, 7260, 7272, 7380, 7384, 7400, 7420, 7424, 7440, 7448, 7614, 7616, 7650, 7656, 7760, 7770, 7776, 7800, 7808, 7830, 7832, 7896, 7980, 7986, 8040, 8136, 8184, 8250, 8256, 8300, 8340, 8346, 8400, 8480, 8484, 8496, 8550, 8556, 8610, 8632, 8652, 8658, 8720, 8850, 8856, 8874, 8900, 8904, 8910, 8988, 9030, 9072, 9088, 9114, 9144, 9212, 9216, 9300, 9306, 9360, 9380, 9384, 9440, 9450, 9480, 9486, 9500, 9504, 9568, 9570, 9576, 9592, 9594, 9700, 9702, 9750, 9776, 9840, 9860, 9864, 9912, 9918, 9954, 9984, 9990, 9996, 10020, 10044, 10050, 10080.

Some larger examples :