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Harshad n.  and  heptagonal n.

First numbers that belong to both sets:

1, 7, 18, 81, 112, 342, 540, 874, 1071, 1404, 1651, 1782, 2205, 3186, 3744, 4774, 4995, 6175, 6426, 8910, 9828, 11799, 12496, 12852, 13950, 17514, 18792, 19228, 20115, 22420, 22896, 24354, 30636, 32890, 35820, 37638, 43362, 45360, 49491, 50908, 51624, 52345, 53802, 58293, 60606, 62964, 65367, 70308, 72846, 78057, 80730, 87142, 89019, 94770, 97713, 99700, 100701, 103734, 106812, 113103, 116316, 121771, 122877, 133056, 134212, 136539, 143640, 147258, 154629, 158382, 162180, 169911, 177822, 181845, 190026, 194184, 195580, 204061, 206928, 211266, 215649, 224550, 229068, 242892, 247590, 261954, 271755, 276723, 293608, 302238, 307476, 318087, 323460, 325261, 338008, 345402, 351000, 356643, 368064, 373842, 383572, 385533, 391446, 399400, 409455, 421686, 423742, 429940, 432016, 440370, 446688, 450925, 465912, 472410, 483340, 485541, 498852, 505575, 516880, 519156, 526014, 537544, 544522, 553896, 568107, 604422, 611820, 626751, 634284, 652036, 657153, 672624, 680427, 693532, 696168, 704106, 728190, 744471, 769230, 791578, 802872, 828576, 872316, 899100, 908118, 935442, 947716, 963171, 991305, 1007110, 1010286, 1019844, 1023040, 1039095, 1048788, 1055275, 1068309, 1078137, 1081423, 1088010, 1097928, 1107891, 1127952, 1138050, 1158381, 1161787, 1168614, 1178892, 1189215, 1209996, 1220454, 1230957, 1252098, 1262736, 1284147, 1294920, 1327509, 1349460, 1382724, 1393902, 1397638, 1416393, 1427706, 1450467, 1461915, 1500400, 1519830, 1531548, 1535464, 1555119, 1566972, 1590813, 1626912, 1639035, 1663416, 1712718, 1750167, 1788021, 1792252, 1813482, 1826280, 1830556, 1864944, 1912750, 1930284, 1939081, 1970028, 2005696, 2023650, 2046205, 2055262, 2064339, 2077992, 2091690, 2133054, 2146932, 2174823, 2184160, 2188836, 2259576, 2302560, 2360502, 2375100, 2433942, 2493504, 2523555, 2538648, 2614788, 2661012, 2676510, 2681686, 2707641, 2723274, 2738952, 2770443, 2786256, 2802114, 2818017, 2887450, 2914380, 2919781, 2995920, 3045384, 3061962, 3095253, 3111966, 3134320, 3145527, 3162375, 3179268, 3196206, 3213189, 3247290, 3264408, 3316032, 3333330, 3350673, 3362260, 3368061, 3402972, 3420495, 3455676, 3467443, 3473334, 3580227, 3616218, 3622234, 3634281, 3670542, 3688740, 3725271, 3731377, 3743604, 3768118, 3774259, 3780405, 3835944, 3910626, 3967110, 3986028.

Some larger examples :