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triangular n.  and  uban n.

First numbers that belong to both sets:

1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 3000025, 49000050, 88000011, 1098000091, 9030000078, 36057000070, 45095000086, 70083000078, 80001000003, 80003000028, 80005000078, 1087039000050, 2000001000000, 2000003000001, 2000005000003, 2000007000006, 2000009000010, 2000011000015, 2000013000021, 2000015000028, 2000017000036, 2000019000045, 2000021000055, 2000023000066, 2000025000078, 2000027000091, 3012009000078, 3086031000066, 8000002000000, 8000006000001, 8000010000003, 8000018000010, 8000022000015, 8000026000021, 8000030000028, 8000038000045, 8000042000055, 8000046000066, 8000050000078, 8088059000035, 18000003000000, 18000009000001, 18000015000003, 18000021000006, 18000027000010, 18000033000015, 18000039000021, 18000045000028, 18000051000036, 18000057000045, 18000063000055, 18000069000066, 18000075000078, 18000081000091, 22049000000028, 32000012000001, 32000020000003, 32000028000006, 32000036000010, 32000052000021, 32000060000028, 32000068000036, 32000076000045, 32000092000066, 38019091000078, 41043082000011, 42021056000076, 46080072000028, 50000005000000, 50000015000001, 50000025000003, 50000035000006, 50000045000010, 50000055000015, 50000065000021, 50000075000028, 50000085000036, 50000095000045, 67030038000096, 71043051000078, 72000006000000, 72000018000001, 72000030000003, 72000042000006, 72000066000015, 72000078000021, 72000090000028, 85029048000028, 86067036000078, 90017075000040, 98000007000000, 98000021000001, 98000035000003, 98000049000006, 98000063000010, 98000077000015, 98000091000021.