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nonagonal n.  and  practical n.

First numbers that belong to both sets:

1, 24, 204, 396, 750, 1216, 1350, 1794, 2484, 3504, 4200, 4446, 5226, 5500, 6666, 7614, 8976, 10836, 12036, 12450, 13734, 19500, 22200, 23904, 24486, 28756, 29394, 31350, 32016, 34056, 37596, 43624, 46000, 49266, 50100, 57024, 59736, 63450, 68250, 71214, 72216, 75264, 80484, 83700, 89200, 101916, 107976, 111696, 112950, 116754, 127206, 128544, 132600, 139500, 143724, 149454, 155296, 161250, 162756, 175056, 179784, 186186, 192700, 194346, 201000, 206064, 226950, 234136, 235950, 241434, 243276, 258264, 264000, 271746, 273700, 287574, 305916, 312156, 314250, 322696, 331254, 346500, 357600, 364344, 366606, 391950, 401376, 413316, 422994, 430326, 440200, 450186, 452700, 460284, 473064, 480816, 491250, 504450, 523224, 536844, 545100, 556206, 559000, 567424, 578754, 604656, 613416, 616350, 661200, 676500, 685764, 698214, 701344, 710776, 713934, 723450, 736236, 752376, 762144, 788500, 791826, 801846, 805200, 815304, 832284, 842556, 856350, 873750, 887796, 898404, 916224, 927000, 945100, 959706, 985536, 1015476, 1019250, 1030614, 1061226, 1065084, 1076700, 1096200, 1107984, 1123794, 1143714, 1155750, 1171896, 1204524, 1237600, 1258500, 1271124, 1292304, 1305096, 1309374, 1322250, 1326556, 1343850, 1356894, 1374384, 1396404, 1409700, 1432000, 1449966, 1463514, 1468044, 1481676, 1504536, 1518336, 1522950, 1536834, 1574166, 1578864, 1593000, 1616700, 1688850, 1693716, 1708356, 1732896, 1747704, 1767546, 1787500, 1812600, 1827744, 1853124, 1868436, 1888950, 1914750, 1935516, 1951164, 1977384, 1993200, 1998486, 2014386, 2019700, 2035684, 2041026, 2057094, 2062464, 2105676, 2121996, 2127450, 2143854, 2165824, 2193444, 2210100, 2238000, 2254824, 2305674, 2322750, 2328456, 2345616, 2374356, 2420704, 2438200, 2444046, 2467500, 2485164, 2514744, 2532576, 2556450, 2586450, 2628744, 2659164, 2677500, 2683626, 2708200, 2732886, 2751474, 2776356, 2807616, 2826456, 2832750, 2851674, 2902446, 2928000, 2960100, 2979444, 2985906, 3031336, 3057450, 3116616, 3136464, 3189700, 3216486, 3223200, 3243384, 3277164, 3304314, 3324750, 3352096, 3358950, 3407124, 3441744, 3462600, 3490506, 3497500, 3553704, 3574896, 3610356, 3631716, 3638850, 3660294, 3667456, 3688984, 3696174, 3746700, 3783000, 3804864, 3812166, 3892950, 3900336, 3959676, 3982044, 4011966, 4042000, 4072146, 4079700, 4102404, 4140384, 4163256.

Some larger examples :