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Harshad n.  and  triangular n.

First numbers that belong to both sets:

1, 3, 6, 10, 21, 36, 45, 120, 153, 171, 190, 210, 300, 351, 378, 465, 630, 666, 780, 820, 990, 1035, 1128, 1275, 1431, 1540, 1596, 1770, 2016, 2080, 2556, 2628, 2850, 2926, 3160, 3240, 3321, 3486, 3570, 4005, 4465, 4560, 4950, 5050, 5460, 5565, 5778, 5886, 7140, 7260, 8001, 8911, 9180, 10011, 10296, 10440, 11175, 11476, 11628, 12720, 13041, 13203, 14196, 14706, 15225, 15400, 15576, 16110, 16290, 16653, 17020, 17205, 17766, 17955, 18145, 18528, 20100, 21321, 21528, 21736, 21945, 22155, 23220, 23436, 24090, 24310, 24976, 25200, 28680, 29646, 30628, 31626, 32640, 33930, 35245, 36585, 37128, 39060, 40470, 41328, 41616, 43365, 43956, 45150, 46360, 51040, 51360, 51681, 52326, 52650, 53956, 56280, 56616, 61776, 63903, 64620, 65341, 67896, 69006, 70125, 70500, 72010, 73536, 73920, 76636, 78210, 79401, 79800, 80200, 81810, 88410, 89676, 90100, 93096, 93528, 97020, 100128, 101025, 103740, 105111, 105570, 106030, 106491, 107880, 113050, 113526, 114003, 115440, 117855, 121771, 122760, 123753, 125250, 127260, 131328, 137550, 139128, 141246, 145530, 146070, 149331, 150426, 151525, 157080, 161028, 163878, 164451, 165600, 170820, 176715, 180300, 182106, 185136, 192510, 195000, 200028, 201930, 202566, 204480, 205120, 209628, 210276, 211575, 218130, 220116, 220780, 222111, 224115, 225456, 226128, 227475, 228150, 231540, 234270, 235641, 236328, 244650, 246753, 253116, 254541, 260281, 264628, 265356, 266085, 270480, 283128, 285390, 286146, 290703, 292230, 296835, 300700, 301476, 303810, 306936, 313236, 314028, 316410, 318801, 320400, 321201, 323610, 327645, 328455, 330078, 332520, 334153, 340725, 343206, 346528, 349030, 352380, 353220, 359128, 370230, 371091, 372816, 373680, 378885, 383250, 386760, 400065, 401856, 404550, 405450, 407253, 416328, 427350, 430128, 440391, 441330, 446040, 453628, 460320, 471906, 475800, 487578, 498501, 499500, 500500, 504510, 506521, 514605, 519690, 520710, 525825, 526851, 536130, 541320, 554931, 558096, 565516, 566580, 580503, 582660, 583740, 595686, 596778, 600060, 609960.

Some larger examples :