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arithmetic n.  and  tau n.

First numbers that belong to both sets:

1, 56, 60, 96, 132, 184, 204, 248, 276, 348, 376, 480, 492, 504, 564, 568, 612, 632, 636, 672, 708, 824, 852, 864, 996, 1016, 1056, 1068, 1208, 1212, 1248, 1284, 1336, 1356, 1520, 1528, 1572, 1592, 1632, 1644, 1656, 1784, 1788, 1824, 1908, 1912, 1980, 2004, 2016, 2076, 2104, 2148, 2160, 2168, 2208, 2232, 2292, 2320, 2364, 2488, 2556, 2688, 2724, 2784, 2796, 2868, 2872, 2936, 2976, 3012, 3060, 3064, 3084, 3156, 3168, 3204, 3228, 3360, 3372, 3384, 3448, 3512, 3516, 3552, 3704, 3732, 3804, 3832, 3852, 3896, 3936, 3968, 4024, 4128, 4140, 4164, 4236, 4284, 4308, 4320, 4512, 4560, 4596, 4668, 4720, 4792, 4812, 4856, 5028, 5048, 5088, 5112, 5172, 5176, 5220, 5280, 5316, 5388, 5472, 5532, 5604, 5664, 5688, 5748, 5752, 5816, 5824, 5856, 5892, 5944, 6008, 6016, 6036, 6048, 6108, 6240, 6252, 6320, 6432, 6444, 6584, 6624, 6684, 6712, 6732, 6756, 6816, 6828, 6904, 6960, 7008, 7044, 7092, 7096, 7116, 7120, 7188, 7288, 7352, 7380, 7392, 7404, 7416, 7584, 7692, 7736, 7764, 7776, 7836, 7864, 7908, 7928, 7956, 7968, 8124, 8160, 8196, 8248, 8312, 8388, 8412, 8460, 8504, 8544, 8628, 8696, 8720, 8736, 8824, 8832, 8916, 8928, 9036, 9108, 9120, 9132, 9144, 9208, 9276, 9312, 9504, 9540, 9564, 9684, 9696, 9708, 9784, 9848, 9852, 9856, 9888, 9924, 10068, 10080, 10112, 10232, 10272, 10284, 10356, 10424, 10464, 10552, 10572, 10616, 10620, 10640, 10644, 10848, 10872, 10932, 10936, 11040, 11120, 11148, 11192, 11232, 11292, 11364, 11384, 11424, 11436, 11484, 11512, 11576, 11628, 11652, 11724, 11768, 11796, 11896, 11904, 11920, 12000, 12024, 12088, 12156, 12192, 12228, 12344, 12372, 12384, 12472, 12536, 12576, 12588, 12664, 12732, 12768, 12780, 12856, 12924, 13092, 13152, 13164, 13236, 13304, 13308, 13344, 13356, 13440.

Some larger examples :