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practical n.  and  self n.

First numbers that belong to both sets:

1, 20, 42, 64, 108, 132, 176, 198, 288, 312, 378, 400, 468, 512, 558, 580, 648, 714, 760, 828, 918, 984, 1032, 1122, 1144, 1188, 1300, 1368, 1458, 1480, 1548, 1638, 1728, 1794, 1840, 1952, 1974, 2088, 2112, 2156, 2178, 2200, 2268, 2380, 2448, 2538, 2560, 2604, 2628, 2784, 2920, 2964, 3008, 3078, 3100, 3168, 3280, 3348, 3392, 3416, 3504, 3528, 3618, 3640, 3752, 3864, 3976, 4136, 4158, 4180, 4248, 4428, 4472, 4720, 4920, 4944, 5148, 5192, 5214, 5238, 5304, 5328, 5418, 5440, 5664, 5776, 5820, 5888, 6000, 6048, 6138, 6160, 6204, 6272, 6318, 6384, 6474, 6496, 6608, 6720, 6900, 6968, 7038, 7104, 7128, 7194, 7216, 7420, 7620, 7644, 7800, 7936, 7980, 8118, 8140, 8184, 8320, 8364, 8432, 8520, 8544, 8610, 8700, 8880, 8970, 9040, 9152, 9174, 9420, 9600, 9690, 9780, 9870, 9960, 10032, 10098, 10212, 10300, 10368, 10458, 10480, 10660, 10728, 10816, 11088, 11178, 11200, 11312, 11336, 11448, 11560, 11628, 11718, 11920, 12056, 12078, 12100, 12168, 12236, 12348, 12416, 12460, 12528, 12640, 12684, 12864, 13024, 13068, 13112, 13158, 13248, 13338, 13360, 13696, 13720, 13832, 13920, 13944, 14058, 14080, 14148, 14238, 14260, 14304, 14416, 14418, 14440, 14484, 14620, 14664, 14820, 14910, 15000, 15048, 15092, 15138, 15204, 15228, 15318, 15340, 15496, 15520, 15720, 15744, 15810, 15834, 15900, 15990, 16038, 16060, 16104, 16128, 16218, 16240, 16284, 16352, 16464, 16576, 16644, 16688, 16800, 16912, 17028, 17072, 17094, 17184, 17296, 17408, 17520, 17544, 17700, 17724, 17836, 17880, 17992, 18040, 18084, 18354, 18444, 18600, 18624, 18690, 18824, 18848, 18870, 18960, 19074, 19096, 19208, 19320, 19344, 19456, 19500, 19680, 19926, 19950, 20088, 20178, 20200, 20224, 20336, 20358, 20448, 20538, 20604, 20628, 20672, 20740, 20874, 21008, 21056, 21100, 21168, 21280, 21392, 21460, 21504, 21528, 21616, 21684.

Some larger examples :