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practical n.  and  Smith n.

First numbers that belong to both sets:

4, 378, 576, 588, 648, 666, 690, 728, 1376, 1736, 1776, 1872, 1908, 1952, 2484, 2556, 2576, 2688, 2944, 2964, 2970, 3168, 3294, 3366, 3564, 3690, 3864, 4428, 4464, 4472, 4592, 4788, 4880, 4960, 5088, 5248, 5772, 5874, 5936, 6084, 6188, 6344, 6760, 6816, 6880, 7062, 7068, 7952, 8372, 8568, 8680, 8736, 8874, 9184, 9296, 9396, 9522, 9648, 9760, 9840, 9880, 9968, 10296, 10494, 10736, 11388, 11696, 11790, 11984, 12558, 12648, 12656, 12684, 13662, 13984, 14058, 14148, 14168, 14464, 14508, 14672, 14688, 14756, 14784, 14832, 14924, 15704, 15824, 15860, 15984, 16192, 16480, 16536, 16592, 16688, 16744, 16770, 16940, 17056, 17238, 17424, 17496, 17664, 17864, 17940, 17982, 18396, 18496, 18732, 18920, 19272, 19292, 19360, 19376, 19602, 19812, 19880, 19952, 21186, 21896, 22368, 22386, 22448, 22816, 23484, 23736, 23790, 24096, 24354, 24552, 24928, 25256, 25392, 25398, 25428, 25844, 26096, 26660, 26676, 26760, 26768, 26840, 26892, 27270, 27280, 27468, 27666, 27756, 27768, 27792, 27846, 28182, 28236, 28280, 28336, 28380, 28392, 28840, 28920, 28952, 28960, 28980, 29172, 29344, 29484, 29540, 29624, 29760, 29960, 30384, 30906, 31096, 31488, 31648, 31724, 31746, 31980, 32648, 32724, 32976, 33384, 33462, 33528, 33672, 33760, 33880, 34182, 34776, 35478, 35680, 35696, 35784, 35796, 36498, 36680, 36990, 37098, 37180, 37560, 37820, 37840, 37848, 37960, 38440, 38560, 38976, 39260, 39432, 39456, 39560, 39720, 39780, 39984, 40672, 40796, 41624, 42276, 42416, 42688, 42780, 42978, 43736, 43992, 44296, 44388, 44928, 45264, 45448, 45792, 45846, 45880, 45936, 46056, 46134, 46992, 47008, 47088, 47656, 47736, 47740, 48048, 48108, 48204, 48356, 48528, 48544, 48654, 48752, 48880, 48980, 49028, 49536, 49680, 49824, 49880, 51678, 51948, 52248, 52624, 52808, 52824, 52938, 52960, 52974, 52992, 53382, 53560, 53664, 53680, 53724, 53728, 53742, 53928, 54234, 54594, 54864, 55384, 55432, 55728, 55848.

Some larger examples :