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Harshad n.  and  oban n.

First numbers that belong to both sets:

3, 5, 6, 7, 8, 9, 10, 12, 18, 20, 27, 30, 36, 50, 60, 63, 70, 80, 90, 300, 306, 308, 312, 315, 320, 330, 333, 336, 360, 370, 375, 378, 396, 399, 500, 506, 510, 511, 512, 513, 516, 518, 550, 555, 558, 576, 588, 600, 603, 605, 612, 629, 630, 660, 666, 690, 700, 711, 715, 720, 730, 735, 736, 738, 756, 770, 777, 780, 800, 803, 810, 820, 825, 828, 870, 880, 888, 900, 910, 912, 915, 918, 935, 936, 960, 966, 990, 999.