Search a number
upside-down n.  and  weak prime

First numbers that belong to both sets:

19, 73, 1559, 7193, 7643, 9551, 12589, 15559, 32587, 37537, 76543, 91591, 94561, 1285289, 1355579, 1375379, 1455569, 1735739, 1825829, 1895129, 1915919, 1985219, 3255587, 3325877, 3335777, 3395177, 3415967, 3445667, 3455567, 3555557, 3735737, 3815927, 3825827, 3895127, 3985217, 7145693, 7165493, 7235783, 7285283, 7485263, 7545653, 7715933, 7825823, 7845623, 7885223, 9125891, 9235781, 9275381, 9375371, 9615941, 9665441, 9685241, 9825821, 9895121, 9915911, 9955511, 11291899, 11328799, 11482699, 11628499, 11673499, 11791399, 11846299, 11946199, 11982199, 12137989, 12155989, 12364789, 12619489, 12728389, 12991189, 13146979, 13191979, 13282879, 13673479, 13773379, 13819279, 13828279, 13837279, 13882279, 13919179, 13937179, 13982179, 13991179, 14219869, 14228869, 14319769, 14373769, 14582569, 14591569, 14628469, 14728369, 14837269, 14846269, 14982169, 15255859, 15264859, 15346759, 15491659, 15555559, 15564559, 15755359, 15891259, 15964159, 16237849, 16328749, 16364749, 16637449, 16655449, 16819249, 16937149, 17319739, 17455639, 17464639, 17855239, 17955139, 17973139, 18228829, 18337729, 18446629, 18619429, 18764329, 18791329, 18991129, 19137919, 19155919, 19237819, 19273819, 19437619, 19446619, 19537519, 19637419, 19746319, 19755319, 19864219, 19946119, 19973119, 19982119, 31191997, 31391797, 31491697, 31664497, 31782397, 32155987, 32182987, 32337787, 32519587, 32555587, 32664487, 32855287, 32864287, 33182977, 33282877, 33319777, 33364777, 33646477, 33673477, 33728377, 33955177, 34173967, 34337767, 34364767, 34519567, 34555567, 34719367, 35528557, 35546557, 35619457, 35664457, 35737357, 35828257, 35891257, 36119947, 36446647, 36573547, 36755347, 36791347, 36828247, 36846247, 36955147, 37119937, 37164937, 37219837, 37346737, 37591537, 37637437, 38237827, 38255827, 38691427, 38737327, 39519517, 39619417, 39737317, 39819217, 71146993, 71419693, 71755393, 71919193, 71928193, 72191983, 72219883, 72228883, 72246883, 72391783, 72428683, 72573583, 72582583, 72591583, 72864283, 72891283, 72919183, 72928183, 72973183, 73337773, 73346773, 73455673, 73564573, 73628473, 73664473, 73682473, 73755373, 73964173, 73982173, 74182963, 74437663, 74537563, 74573563, 74737363, 74755363, 74891263, 74955163, 75164953, 75173953, 75273853, 75337753, 75346753, 75428653, 75546553, 75655453, 75946153, 76119943, 76182943, 76337743, 76519543, 76882243, 77146933, 77219833, 77319733, 77382733, 77482633, 77546533, 77764333, 77873233, 77946133, 78191923, 78364723, 78455623, 78482623, 78519523, 78591523, 78855223, 78864223, 79128913, 79237813, 79246813, 79264813, 79382713, 79446613, 79637413, 79682413, 79837213, 91346791, 91382791, 91482691, 91491691, 91573591, 91582591, 91719391, 91728391, 91782391.

Some larger examples :