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centered nonagonal n.  and  Harshad n.

First numbers that belong to both sets:

1, 10, 190, 820, 1540, 2080, 2926, 3160, 4465, 5050, 8911, 11476, 15400, 17020, 18145, 21736, 24310, 24976, 30628, 35245, 46360, 51040, 53956, 65341, 72010, 76636, 80200, 90100, 106030, 113050, 121771, 151525, 205120, 220780, 260281, 264628, 300700, 334153, 346528, 349030, 359128, 453628, 500500, 506521, 565516, 627760, 658378, 672220, 810901, 837865, 893116, 913276, 937765, 979300, 987715, 1030330, 1043290, 1060696, 1127251, 1149886, 1154440, 1214461, 1228528, 1304920, 1334161, 1423828, 1505980, 1606528, 1628110, 1693720, 1811656, 1840321, 1921780, 1951300, 2029105, 2041210, 2047276, 2145556, 2183005, 2265256, 2303731, 2421100, 2507680, 2514403, 2748340, 2783620, 2804896, 3036880, 3156328, 3194128, 3465028, 3592540, 3632860, 3746953, 3955078, 4056976, 4117015, 4238416, 4282201, 4335040, 4504501, 4622320, 4713985, 4741660, 4947085, 4965976, 5273128, 5400541, 5670028, 5791906, 5832820, 5873878, 6029128, 6049981, 6175855, 6420736, 6626620, 6802516, 6846850, 6857956, 6980716, 7003153, 7218100, 7252336, 7263766, 7681240, 7834861, 8002000, 8098300, 8588440, 8738290, 8952796, 9054640, 9208486, 9572500, 10226503, 10253656, 10308070, 10321696, 10540936, 10804276, 11014471, 11028556, 11099116, 11831680, 11904760, 12110581, 12663028, 12844846, 12982060, 13227796, 13274128, 13804885, 13852216, 14153860, 14394295, 14410396, 14491036, 14996026, 15061816, 15193828, 15326416, 15677200, 15811876, 16134040, 16270660, 16356340, 16632028, 16875145, 16962400, 17084935, 17120026, 17243128, 17331328, 17615080, 17739946, 18027010, 18243820, 18334540, 18407278, 18865153, 18994366, 19086931, 19571896, 20024956, 20139031, 20253430, 20425636, 20502406, 20733580, 21199816, 21612025, 21690991, 21928753, 22207780, 22953700, 23137003, 23177836, 23341528, 23650003, 23670640, 23939740, 24106096, 24189490, 24713965, 24967711, 25758253, 26582986, 26912116, 27265420, 27376300, 27934075, 28520128, 28975078, 29618056, 29803060, 30291436, 30478528, 30736720, 31232656, 31613176, 32068036, 32140153, 32963140, 33427576, 34341328, 34815340, 34965703, 35217028, 35343028, 35900101, 36205795, 36231328, 36641080, 36846820, 37389628, 37597456, 37805860, 38119546, 38777221, 39094903, 39760903, 40002040, 40756906, 41001040, 41082580, 41218660, 42177520, 43818841, 44184700, 44325820, 44410600, 44864128, 45120250, 45205786, 45778096, 45921736, 46267390, 47545876, 48073915, 48427561, 49526128, 50005000, 50275378, 50969656, 51273001, 51364180, 51394591, 52433920, 53081056, 53794378, 54012421, 54826156, 55203778, 56376271, 56695276, 57175471, 57561085, 57722140, 58368610.

Some larger examples :