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semiprime  and  strobogrammatic n.

First numbers that belong to both sets:

69, 111, 689, 818, 1111, 1691, 1961, 6009, 6119, 6889, 8698, 9886, 10001, 10801, 11111, 18881, 68189, 68889, 69169, 69869, 81118, 86098, 90106, 90806, 98086, 100001, 106901, 109601, 161191, 186981, 190061, 600009, 601109, 610019, 611119, 616919, 618819, 680089, 698869, 869698, 988886, 989686, 1000001, 1001001, 1081801, 1090601, 1098601, 1101011, 1111111, 1118111, 1610191, 1611191, 1668991, 1680891, 1691691, 1698691, 1801081, 1808081, 1868981, 1910161, 1968961, 6000009, 6001009, 6018109, 6091609, 6098609, 6111119, 6160919, 6168919, 6180819, 6181819, 6198619, 6601099, 6618199, 6661999, 6680899, 6691699, 6861989, 6880889, 6888889, 6901069, 6911169, 6968969, 6980869, 6981869, 6991669, 8108018, 8118118, 8198618, 8680898, 8690698, 8691698, 9018106, 9081806, 9801086, 9880886, 9918166, 9981866, 10000001, 10096001, 10196101, 10600901, 10688901, 10696901, 10869801, 10896801, 10900601, 10969601, 11088011, 11696911, 11800811, 11900611, 11988611, 16000091, 16088091, 16169191, 16696991, 16800891, 16988691, 18011081, 18088081, 18169181, 18696981, 18969681, 18988681, 19000061, 19011061, 19096061, 19100161, 19111161, 19600961, 19669961, 19688961, 19696961, 19888861, 19996661, 60000009, 60100109, 60111109, 60196109, 60688909, 60888809, 60896809, 61000019, 61069019, 61088019, 61100119, 61111119, 61188119, 61600919, 61688919, 61811819, 61888819, 61996619, 66196199, 66611999, 66869899, 68000089, 68088089, 68111189, 68196189, 68611989, 68996689, 69011069, 69088069, 69111169, 69188169, 69669969, 69688969, 69869869, 69896869, 81688918, 81869818, 81896818, 86000098, 86069098, 86800898, 86811898, 86900698, 86996698, 90800806, 90911606, 98069086, 98088086, 98111186, 98900686, 99169166, 99611966, 99911666.