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centered triangular n.  and  Harshad n.

First numbers that belong to both sets:

1, 4, 10, 460, 2584, 2710, 4294, 5491, 9010, 14554, 18316, 20710, 22510, 25156, 36271, 42085, 52174, 75601, 135451, 151210, 191710, 220609, 234631, 243010, 291061, 307135, 316711, 342010, 371260, 400159, 459544, 461206, 514216, 619210, 626944, 831421, 840379, 1039585, 1052110, 1057141, 1105534, 1257211, 1284826, 1309936, 1583635, 1810054, 1853149, 1883281, 2002771, 2151010, 2161801, 2205235, 2208874, 2300824, 2937901, 3112561, 3121210, 3310066, 3694996, 3728029, 3770716, 4022110, 4180846, 4221010, 4404124, 4659610, 4702006, 4707319, 5220136, 5327011, 5497966, 5544010, 5659960, 5747710, 6251584, 6306826, 6834136, 7014610, 7442635, 7897096, 8077081, 8478760, 8622010, 8802760, 9423814, 9491611, 9818884, 10120510, 10434610, 10874335, 10947154, 11101681, 11638516, 11713846, 12420010, 12428644, 12506485, 12811510, 13120210, 13244719, 13316131, 13721401, 13775896, 13985794, 14086741, 14169604, 14954710, 15002110, 15936511, 17807206, 19197760, 19369864, 19499446, 19683760, 20000179, 20807851, 21404260, 21757009, 21859960, 22832554, 22938016, 23020210, 23934046, 24030010, 24694960, 25000210, 25061485, 25221151, 25777756, 26214871, 26794954, 27215011, 27394204, 27509710, 28285960, 28717501, 29178766, 29483884, 29830711, 31402801, 31498960, 32023531, 33680074, 33808135, 34884760, 35015089, 35145661, 36376051, 36509134, 37762960, 39313921, 39899710, 40303009, 40614619, 40755235, 42222496, 43006006, 43570066, 43715704, 44040214, 45086710, 45796726, 45995860, 46078960, 46112221, 46629301, 46947646, 49000411, 49378360, 51412756, 51430321, 53059135, 53595760, 54009001, 54731461, 54985456, 56669194, 56890684, 58322191, 58809574, 58828360, 59904121, 60779386, 61200235, 61430401, 61680235, 62162110, 62548960, 63034210, 65468764, 67284760, 67345051, 68191960, 69044161, 69635674, 69881176, 71135824, 71528896, 72610210, 72965476, 75030385, 75646954, 76866184, 77274760, 77619664, 78246760, 78854626, 81375886, 82528960, 82907686, 83130871, 85220860, 87864094, 89177716, 91599616, 93555760, 94624960, 95676274, 96516694, 97893244, 98184286, 99328360, 102651385, 102850021, 104997484, 105223501, 107319334, 107598646, 107802010, 109358974, 109666576, 109923241, 109948924, 111030319, 111211066, 111521260, 112324594, 113000581, 114515860, 115172110, 117682960, 118881760, 118988614, 123111811, 123302134, 123955786, 124720564, 125377960, 131596984, 132469510, 135104386, 136017010, 137477854, 137592760, 140190835, 144574960, 145518976, 145873774, 145903360, 147564964, 151187341, 151729960, 152213104, 153788626, 154275034, 155891746, 156258964, 156595960, 159057760, 159088654, 162880231, 165548296, 165800524, 166558360, 168460510, 171430186, 173617984, 173973196, 182077960, 183568360.

Some larger examples :