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amenable n.  and  powerful n.

First numbers that belong to both sets:

1, 8, 9, 16, 25, 32, 36, 49, 64, 72, 81, 100, 108, 121, 125, 128, 144, 169, 196, 200, 216, 225, 256, 288, 289, 324, 361, 392, 400, 432, 441, 484, 500, 512, 529, 576, 625, 648, 676, 729, 784, 800, 841, 864, 900, 961, 968, 972, 1000, 1024, 1089, 1125, 1152, 1156, 1225, 1296, 1352, 1369, 1372, 1444, 1521, 1568, 1600, 1681, 1728, 1764, 1800, 1849, 1936, 1944, 2000, 2025, 2048, 2116, 2197, 2209, 2304, 2312, 2401, 2500, 2592, 2601, 2700, 2704, 2744, 2809, 2888, 2916, 3025, 3125, 3136, 3200, 3249, 3364, 3456, 3481, 3528, 3600, 3721, 3844, 3872, 3888, 3969, 4000, 4096, 4225, 4232, 4356, 4489, 4500, 4608, 4624, 4761, 4900, 4913, 5000, 5041, 5184, 5292, 5324, 5329, 5400, 5408, 5476, 5488, 5625, 5776, 5832, 5929, 6084, 6125, 6241, 6272, 6400, 6561, 6724, 6728, 6889, 6912, 7056, 7200, 7225, 7396, 7569, 7688, 7744, 7776, 7921, 8000, 8100, 8192, 8281, 8464, 8649, 8712, 8748, 8788, 8836, 9000, 9025, 9216, 9248, 9261, 9409, 9604, 9800, 9801, 10000, 10125, 10201, 10368, 10404, 10584, 10609, 10648, 10800, 10816, 10952, 10976, 11025, 11236, 11449, 11552, 11664, 11881, 12100, 12168, 12321, 12348, 12500, 12544, 12769, 12800, 12996, 13068, 13225, 13448, 13456, 13500, 13689, 13824, 13924, 14112, 14161, 14400, 14641, 14792, 14884, 15125, 15129, 15376, 15488, 15552, 15625, 15876, 16000, 16129, 16200, 16384, 16641, 16900, 16928, 17161, 17424, 17496, 17576, 17672, 17689, 17956, 18000, 18225, 18252, 18432, 18496, 18769, 19044, 19208, 19321, 19600, 19652, 19773, 19881, 20000, 20164, 20449, 20736, 20808, 21025, 21125, 21168, 21296, 21316, 21600, 21609, 21632, 21904, 21952, 22201, 22472, 22500, 22801, 23104, 23328, 23409, 23716, 24025, 24200, 24300, 24336, 24389, 24500, 24649, 24696, 24964, 25000, 25088, 25281, 25600, 25921, 25992.

Some larger examples :