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happy n.  and  practical n.

First numbers that belong to both sets:

1, 28, 32, 100, 176, 192, 208, 280, 320, 368, 392, 440, 464, 496, 608, 644, 680, 700, 736, 784, 820, 860, 888, 912, 1000, 1088, 1092, 1122, 1128, 1148, 1152, 1184, 1188, 1218, 1288, 1290, 1300, 1332, 1472, 1484, 1512, 1518, 1760, 1880, 1888, 1900, 1920, 1976, 2080, 2112, 2190, 2300, 2360, 2448, 2478, 2484, 2548, 2574, 2752, 2754, 2784, 2800, 2844, 2856, 3100, 3132, 3200, 3312, 3328, 3332, 3380, 3392, 3456, 3536, 3560, 3564, 3608, 3654, 3680, 3760, 3920, 3968, 3978, 4004, 4096, 4144, 4248, 4284, 4356, 4400, 4428, 4482, 4536, 4554, 4640, 4752, 4788, 4824, 4872, 4888, 4900, 4944, 4960, 5056, 5112, 5248, 5346, 5360, 5454, 5472, 5544, 5628, 5712, 5724, 5742, 5824, 5994, 6032, 6080, 6136, 6320, 6380, 6440, 6528, 6534, 6560, 6656, 6798, 6800, 7000, 7084, 7252, 7254, 7360, 7452, 7480, 7488, 7524, 7552, 7744, 7788, 7840, 7848, 7878, 7884, 7896, 7900, 7938, 7968, 7986, 8036, 8060, 8112, 8118, 8128, 8200, 8256, 8360, 8424, 8442, 8512, 8526, 8600, 8652, 8704, 8740, 8748, 8778, 8784, 8848, 8874, 8880, 8976, 9040, 9064, 9100, 9120, 9400, 9460, 9594, 9604, 9632, 9700, 9768, 9912, 9954, 9968, 10000, 10088, 10092, 10112, 10152, 10212, 10218, 10290, 10300, 10332, 10472, 10512, 10528, 10752, 10812, 10880, 10900, 10920, 10976, 11088, 11120, 11124, 11152, 11154, 11214, 11220, 11232, 11248, 11250, 11280, 11284, 11322, 11328, 11388, 11408, 11480, 11502, 11508, 11520, 11564, 11808, 11832, 11840, 11850, 11880, 12012, 12090, 12120, 12138, 12150, 12180, 12192, 12210, 12220, 12276, 12312, 12330, 12348, 12384, 12456, 12474, 12510, 12546, 12580, 12628, 12636, 12654, 12672, 12726, 12740, 12744, 12750, 12792, 12810, 12834, 12880, 12900, 12972, 12996, 13000, 13032, 13122, 13158, 13182, 13184, 13188, 13230, 13248, 13266, 13284, 13300, 13320, 13332.

Some larger examples :