Search a number
lucky n.  and  unprimeable n.

First numbers that belong to both sets:

535, 895, 1645, 1675, 1765, 1965, 2365, 3055, 3175, 3235, 3565, 3685, 3955, 3975, 4035, 4105, 4165, 4195, 4315, 5455, 5755, 5965, 6415, 6435, 6505, 6535, 6625, 6745, 7135, 7405, 8475, 8635, 8655, 9075, 9085, 9115, 9145, 9775, 9895, 9915, 9985, 10125, 10575, 10965, 11205, 11535, 11725, 11845, 11995, 12025, 12295, 12315, 13135, 13285, 13345, 14095, 14115, 14185, 14395, 14905, 15025, 15205, 15655, 15835, 16045, 16395, 16795, 16915, 17085, 17215, 17305, 17455, 17545, 17695, 17775, 17875, 17965, 18025, 18175, 18295, 18475, 18655, 18765, 18825, 19195, 19225, 19365, 19615, 19825, 19875, 20425, 20455, 20605, 20835, 21075, 21115, 21205, 21255, 21445, 21475, 21655, 22165, 22525, 22555, 22585, 22795, 22885, 23515, 23965, 24145, 24585, 24645, 24865, 24895, 25285, 25855, 26035, 26215, 26365, 26655, 26935, 27205, 27265, 27315, 27415, 27595, 27975, 28195, 28245, 28365, 28375, 28525, 28735, 28765, 28825, 28995, 29095, 29185, 29515, 29845, 29905, 29995, 30475, 30565, 31405, 31425, 31945, 32245, 32455, 32545, 32595, 32665, 32875, 33435, 33445, 33835, 34005, 34105, 34995, 35035, 35485, 35625, 36025, 36115, 36175, 36325, 36405, 36415, 36615, 36955, 37075, 37285, 37345, 37435, 37455, 37705, 38245, 38535, 38685, 38775, 38815, 38985, 39265, 39285, 39475, 39945, 40225, 40335, 40405, 40665, 41365, 41425, 41485, 41635, 42055, 42525, 42625, 42885, 43255, 43345, 43735, 43815, 44145, 44395, 44595, 44995, 45145, 45625, 45685, 45745, 46015, 46035, 46245, 46255, 46405, 46465, 46735, 46795, 46845, 46965, 47005, 47065, 47155, 47425, 47575, 47665, 47895, 48205, 48895, 48925, 49315, 49375, 49585, 49675, 49795, 50575, 50695, 50935, 51085, 51355, 51955, 52045, 52275, 52425, 52465, 52845, 53155, 53245, 53575, 53745, 53875, 54075, 54475, 54655, 54735, 55035, 55095, 55195, 55425, 55555, 55705, 55975, 56185, 56275, 56725, 56755, 56935, 57025, 57355, 57405, 57625, 58135, 58465, 58645, 58795, 58815, 58845, 58875, 59325, 59605.

Some larger examples :