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congruent n.  and  tau n.

First numbers that belong to both sets:

24, 56, 60, 80, 84, 88, 96, 136, 152, 156, 180, 184, 240, 248, 252, 276, 344, 348, 372, 376, 384, 444, 448, 468, 472, 480, 504, 536, 564, 568, 600, 632, 636, 664, 720, 732, 776, 792, 824, 828, 852, 856, 864, 876, 880, 896, 904, 948, 1016, 1040, 1044, 1048, 1112, 1116, 1164, 1176, 1208, 1212, 1224, 1236, 1248, 1304, 1308, 1332, 1336, 1344, 1360, 1368, 1408, 1432, 1476, 1520, 1524, 1528, 1544, 1592, 1620, 1632, 1656, 1688, 1692, 1784, 1788, 1812, 1816, 1884, 1908, 1912, 1920, 1944, 1980, 2000, 2004, 2008, 2016, 2056, 2076, 2104, 2160, 2168, 2172, 2176, 2196, 2208, 2232, 2264, 2292, 2320, 2340, 2364, 2388, 2432, 2456, 2488, 2556, 2640, 2648, 2676, 2696, 2748, 2772, 2776, 2784, 2844, 2868, 2872, 2892, 2904, 2936, 2944, 3032, 3060, 3064, 3096, 3156, 3168, 3228, 3252, 3280, 3324, 3352, 3360, 3384, 3420, 3440, 3448, 3456, 3464, 3512, 3516, 3544, 3552, 3636, 3704, 3708, 3732, 3736, 3804, 3832, 3896, 3924, 3928, 3936, 3968, 3992, 4024, 4032, 4056, 4080, 4184, 4188, 4240, 4248, 4284, 4308, 4320, 4376, 4404, 4476, 4480, 4500, 4504, 4560, 4568, 4572, 4596, 4616, 4668, 4696, 4720, 4744, 4764, 4788, 4792, 4824, 4856, 4860, 4896, 4928, 4932, 4952, 4992, 5048, 5052, 5088, 5112, 5128, 5144, 5148, 5172, 5176, 5220, 5268, 5272, 5280, 5360, 5364, 5384, 5436, 5464, 5472, 5504, 5528, 5532, 5556, 5652, 5688, 5748, 5752, 5796, 5816, 5840, 5844, 5856, 5912, 5944, 5976, 6000, 6008, 6012, 6016, 6036, 6108, 6144, 6228, 6240, 6296, 6320, 6488, 6492, 6516, 6528, 6584, 6616, 6624, 6640, 6684, 6712, 6804, 6816, 6872, 6876, 6904, 6924, 6936, 6984, 7008, 7040, 7048, 7064, 7092, 7096, 7120, 7164, 7188, 7256, 7280, 7284, 7288, 7352.

Some larger examples :