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frugal n.  and  semiprime

First numbers that belong to both sets:

1369, 1681, 1849, 2209, 2809, 3481, 3721, 4489, 5041, 5329, 6241, 6889, 7921, 9409, 10201, 10609, 11449, 11881, 12769, 16129, 17161, 18769, 19321, 22201, 22801, 24649, 26569, 27889, 29929, 32041, 32761, 36481, 37249, 38809, 39601, 44521, 49729, 51529, 52441, 54289, 57121, 58081, 63001, 66049, 69169, 72361, 73441, 76729, 78961, 80089, 85849, 94249, 96721, 97969, 100489, 109561, 113569, 120409, 121801, 124609, 128881, 134689, 139129, 143641, 146689, 151321, 157609, 160801, 167281, 175561, 177241, 185761, 187489, 192721, 196249, 201601, 208849, 212521, 214369, 218089, 229441, 237169, 241081, 249001, 253009, 259081, 271441, 273529, 292681, 299209, 310249, 316969, 323761, 326041, 332929, 344569, 351649, 358801, 361201, 368449, 375769, 380689, 383161, 398161, 410881, 413449, 418609, 426409, 434281, 436921, 452929, 458329, 466489, 477481, 491401, 502681, 516961, 528529, 537289, 546121, 552049, 564001, 573049, 579121, 591361, 597529, 619369, 635209, 654481, 657721, 674041, 677329, 683929, 687241, 703921, 727609, 734449, 737881, 744769, 769129, 776161, 779689, 786769, 822649, 829921, 844561, 863041, 877969, 885481, 896809, 908209, 935089, 942841, 954529, 966289, 982081, 994009, 1018081, 1026169, 1038361, 1042441, 1062961, 1067089, 1079521, 1100401, 1104601, 1125721, 1129969, 1142761, 1181569, 1190281, 1194649, 1203409, 1216609, 1229881, 1247689, 1261129, 1274641, 1324801, 1329409, 1352569, 1371241, 1394761, 1408969, 1423249, 1442401, 1471369, 1481089, 1495729, 1510441, 1515361, 1530169, 1560001, 1585081, 1630729, 1635841, 1646089, 1661521, 1666681, 1682209, 1692601, 1697809, 1708249, 1739761, 1745041, 1760929, 1852321, 1868689, 1885129, 1907161, 1957201, 1985281, 2024929, 2036329, 2042041, 2053489, 2070721, 2093809, 2105401, 2111209, 2128681, 2163841, 2193361, 2199289, 2211169, 2217121, 2229049, 2247001, 2283121, 2319529, 2343961, 2380849, 2399401, 2411809, 2430481, 2455489, 2468041, 2493241, 2505889, 2550409, 2563201, 2582449, 2588881, 2601769, 2621161, 2627641, 2647129, 2679769, 2745649, 2765569, 2778889, 2785561, 2866249, 2879809, 2886601, 2920681, 2961841, 2968729, 3003289, 3031081, 3052009, 3073009, 3094081, 3157729, 3179089, 3193369, 3200521, 3243601, 3279721, 3323329, 3352561, 3411409, 3463321, 3485689, 3500641, 3508129, 3523129, 3530641, 3568321, 3613801.

Some larger examples :