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centered decagonal n.  and  Harshad n.

First numbers that belong to both sets:

1, 3781, 20801, 50501, 102961, 197011, 368561, 488281, 556111, 569531, 614251, 992351, 1060301, 1272601, 1417781, 1460701, 1749361, 1918901, 2281501, 2349551, 2495711, 2531161, 3481951, 3693701, 3876401, 4479311, 4680281, 5859031, 6199411, 6277601, 6606751, 7290281, 7546061, 8652701, 9241201, 9268411, 9542711, 9765031, 9835031, 10782461, 11423161, 11712151, 12097901, 12426761, 13489031, 13836161, 14154031, 16882031, 18116561, 18518501, 19119901, 19730911, 19810451, 20493001, 21228301, 21621601, 23882051, 24520051, 24853351, 25346261, 25662451, 25821281, 27342911, 27836201, 28001611, 29415251, 31462861, 31563281, 31588411, 33114511, 33787001, 36086411, 38461511, 39046151, 42006511, 42500701, 46040951, 46680401, 47170561, 48127531, 51472361, 52148351, 52504201, 56129251, 57172711, 57206531, 60187151, 63243461, 64566211, 65685001, 67142801, 73670411, 76225601, 80500781, 83170811, 84029501, 91015111, 94156301, 101858411, 102808451, 106791311, 113311801, 114074761, 114218101, 114984101, 115032061, 118170911, 119194031, 122438261, 124425661, 126781301, 127790401, 132020911, 140264561, 140635561, 141379031, 142284451, 144910361, 151222501, 153818311, 154429031, 155542531, 155821531, 159301901, 164250461, 175617011, 180810911, 184801601, 186080501, 186324601, 188221801, 190005301, 190128611, 190437061, 195531311, 203745361, 205729051, 206049901, 208044751, 212193551, 213563801, 221811301, 221944531, 223680161, 224349511, 226430851, 229537001, 230962061, 243427531, 249041531, 253721261, 255219401, 260678101, 262921261, 267802211, 272654201, 274207151, 283542151, 287244101, 300583811, 304941451, 305722901, 307210411, 307367201, 312563711, 314226281, 319480211, 324616531, 326472401, 327119161, 327523711, 328171511, 333540281, 342419501, 347903111, 350075281, 353094061, 374242261, 400020401, 400557251, 402439061, 408201301, 408382031, 416282501, 418200851, 420765511, 424074451, 426934201, 434265401, 440438051, 450158161, 450632711, 456920201, 473510461, 473705111, 476532031, 477020281, 500050001, 504158611, 504660811, 507780031, 508183211, 528032261, 532563601, 537010661, 561111211, 561747001, 562171061, 562277101, 583038011, 609242411, 611562701, 622449031, 626472211, 650427151, 658206011, 719340151, 719460101, 719940001, 743041451, 753194011, 764404301, 804102211, 816450311, 819136001, 819264001, 830309411, 850142801, 860081701, 861525011, 864152311, 910642601, 922421531, 934823011, 1008413011, 1011966511, 1016381531, 1017094531, 1028823401, 1030401901, 1041340961, 1052047651, 1052773051, 1053934211, 1057276111, 1060332031, 1066603151, 1082435411, 1092168101, 1092907201, 1095274001, 1098236101, 1110720601, 1118035811, 1121178251, 1134243911, 1134545161, 1144206281, 1157405051, 1180032031, 1182491311, 1200707561, 1210957031, 1214227361, 1215318451, 1220937511, 1224534251, 1241494031, 1255240901, 1259205151, 1264129501, 1265720051, 1279600031, 1303870261, 1308881101, 1309690201, 1321694111, 1339311611, 1350135281, 1355234161.

Some larger examples :