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interprime n.  and  oban n.

First numbers that belong to both sets:

6, 9, 12, 15, 18, 26, 30, 39, 50, 56, 60, 69, 76, 86, 93, 99, 300, 309, 312, 315, 356, 363, 370, 376, 386, 393, 399, 506, 515, 560, 566, 570, 590, 596, 600, 610, 615, 618, 625, 636, 650, 656, 660, 667, 675, 680, 687, 696, 705, 723, 730, 736, 759, 765, 780, 803, 810, 816, 825, 828, 855, 858, 870, 879, 885, 897, 909, 915, 933, 939, 950, 960, 969, 980, 987.