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oban n.  and  semiprime

First numbers that belong to both sets:

6, 9, 10, 15, 25, 26, 33, 35, 38, 39, 55, 57, 58, 65, 69, 77, 85, 86, 87, 93, 95, 303, 305, 309, 319, 323, 326, 327, 329, 335, 339, 355, 358, 365, 377, 386, 393, 395, 398, 505, 511, 515, 517, 519, 526, 527, 529, 533, 535, 537, 538, 553, 559, 565, 566, 573, 579, 583, 586, 589, 597, 611, 623, 626, 629, 633, 635, 655, 667, 669, 679, 685, 687, 689, 695, 697, 698, 699, 703, 706, 707, 713, 717, 718, 723, 737, 753, 755, 758, 763, 766, 767, 778, 779, 785, 789, 793, 799, 803, 807, 813, 815, 817, 818, 835, 838, 865, 866, 869, 878, 879, 886, 889, 893, 895, 898, 899, 905, 913, 917, 923, 926, 933, 939, 955, 958, 959, 965, 973, 979, 985, 989, 993, 995, 998.