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semiprime  and  Ulam n.

First numbers that belong to both sets:

4, 6, 26, 38, 57, 62, 69, 77, 82, 87, 106, 145, 155, 177, 206, 209, 219, 221, 253, 309, 319, 339, 341, 358, 382, 451, 485, 497, 502, 566, 685, 695, 734, 781, 849, 866, 893, 905, 949, 1018, 1037, 1079, 1081, 1101, 1157, 1167, 1169, 1186, 1191, 1257, 1313, 1355, 1387, 1389, 1465, 1509, 1514, 1538, 1594, 1641, 1643, 1646, 1707, 1765, 1814, 1853, 1858, 1919, 1941, 1966, 1985, 2095, 2117, 2249, 2327, 2462, 2481, 2513, 2581, 2589, 2721, 2723, 2762, 2787, 2809, 2811, 2831, 2899, 2921, 2987, 3029, 3031, 3043, 3065, 3085, 3107, 3131, 3153, 3205, 3207, 3214, 3239, 3261, 3263, 3305, 3415, 3473, 3481, 3622, 3649, 3669, 3742, 3974, 3991, 3994, 4101, 4121, 4187, 4258, 4341, 4343, 4453, 4531, 4534, 4619, 4622, 4666, 4754, 4798, 4881, 4883, 4927, 4971, 5057, 5079, 5186, 5269, 5294, 5318, 5357, 5489, 5533, 5597, 5599, 5663, 5765, 5853, 5873, 5878, 6046, 6049, 6051, 6107, 6134, 6178, 6239, 6242, 6283, 6393, 6418, 6437, 6457, 6459, 6523, 6635, 6782, 6865, 6889, 6914, 6931, 6938, 6982, 7041, 7063, 7082, 7195, 7197, 7217, 7427, 7471, 7478, 7522, 7737, 7754, 7779, 7781, 7886, 7977, 7979, 8057, 8077, 8143, 8453, 8509, 8531, 8553, 8617, 8639, 8705, 8749, 8751, 8773, 8817, 8842, 8873, 8917, 8947, 8966, 8983, 9071, 9179, 9193, 9313, 9355, 9357, 9379, 9445, 9509, 9553, 9577, 9641, 9663, 9665, 9809, 9853, 9917, 9939, 9961, 9983, 9985, 10085, 10173, 10249, 10349, 10393, 10415, 10523, 10537, 10547, 10606, 10655, 10677, 10679, 10694, 10713, 10757, 10779, 10862, 10911, 10931, 10977, 10997, 10999, 11099, 11107, 11146, 11195, 11217, 11219, 11278, 11302, 11366, 11434, 11498, 11603, 11647, 11735, 11757, 11759, 11881, 11967, 12055, 12057, 12074, 12187, 12365, 12443, 12526, 12602, 12622.

Some larger examples :