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economical n.  and  semiprime

First numbers that belong to both sets:

10, 14, 15, 21, 25, 35, 49, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 141, 142, 145, 146, 155, 158, 159, 161, 166, 169, 177, 178, 183, 185, 194, 201, 203, 205, 213, 215, 217, 219, 235, 237, 249, 259, 265, 267, 287, 289, 291, 295, 301, 305, 329, 335, 355, 361, 365, 371, 395, 413, 415, 427, 445, 469, 485, 497, 511, 529, 553, 581, 623, 679, 841, 961, 1003, 1006, 1007, 1011, 1018, 1027, 1037, 1041, 1042, 1043, 1046, 1047, 1055, 1057, 1059, 1067, 1073, 1077, 1079, 1081, 1082, 1094, 1099, 1101, 1114, 1115, 1119, 1121, 1126, 1135, 1137, 1138, 1139, 1141, 1142, 1145, 1147, 1149, 1154, 1157, 1159, 1165, 1167, 1169, 1174, 1186, 1189, 1191, 1195, 1198, 1202, 1203, 1205, 1207, 1211, 1214, 1219, 1226, 1227, 1234, 1238, 1241, 1247, 1253, 1255, 1257, 1261, 1262, 1263, 1267, 1271, 1273, 1282, 1285, 1286, 1293, 1294, 1299, 1306, 1315, 1317, 1318, 1322, 1329, 1333, 1337, 1343, 1345, 1346, 1347, 1349, 1351, 1354, 1355, 1357, 1363, 1366, 1369, 1371, 1379, 1382, 1383, 1385, 1387, 1389, 1393, 1401, 1402, 1403, 1405, 1411, 1415, 1418, 1437, 1438, 1454, 1457, 1461, 1465, 1466, 1473, 1477, 1478, 1486, 1497, 1501, 1502, 1509, 1513, 1514, 1517, 1522, 1527, 1535, 1537, 1538, 1541, 1546, 1555, 1561, 1563, 1565, 1569, 1574, 1577, 1585, 1589, 1591, 1594, 1603, 1618, 1622, 1623, 1631, 1633, 1641, 1642, 1643, 1646, 1649, 1654, 1655, 1658, 1671, 1673, 1678, 1679, 1681, 1685, 1687, 1689, 1691, 1706, 1707, 1711, 1713, 1714, 1718, 1726, 1731, 1735, 1739, 1745, 1754, 1757, 1761, 1762, 1763, 1765, 1766, 1769, 1774, 1779, 1795, 1797, 1799, 1803, 1814, 1817, 1821, 1822, 1829, 1835, 1838, 1839, 1841.

Some larger examples :