Search a number
congruent n.  and  unprimeable n.

First numbers that belong to both sets:

206, 208, 320, 325, 326, 510, 514, 518, 532, 534, 535, 536, 622, 624, 628, 840, 845, 846, 848, 890, 892, 894, 895, 896, 1070, 1076, 1078, 1134, 1135, 1136, 1140, 1142, 1144, 1145, 1146, 1148, 1262, 1264, 1268, 1330, 1332, 1334, 1335, 1336, 1340, 1342, 1344, 1346, 1350, 1358, 1412, 1414, 1415, 1460, 1462, 1464, 1468, 1500, 1502, 1504, 1640, 1645, 1646, 1648, 1670, 1678, 1684, 1685, 1686, 1688, 1710, 1716, 1718, 1760, 1762, 1765, 1766, 1768, 1790, 1792, 1794, 1798, 1852, 1854, 1855, 1856, 1858, 1890, 1894, 1895, 1920, 1925, 1926, 1965, 1966, 2040, 2044, 2045, 2046, 2070, 2072, 2076, 2078, 2100, 2102, 2104, 2108, 2182, 2184, 2190, 2192, 2195, 2196, 2198, 2320, 2324, 2325, 2326, 2328, 2360, 2364, 2365, 2366, 2368, 2400, 2405, 2406, 2408, 2484, 2485, 2486, 2488, 2492, 2494, 2495, 2496, 2510, 2512, 2516, 2518, 2565, 2566, 2580, 2582, 2584, 2588, 2822, 2940, 2942, 2944, 2945, 2982, 3054, 3055, 3056, 3090, 3092, 3094, 3095, 3096, 3142, 3145, 3150, 3152, 3156, 3158, 3172, 3174, 3175, 3230, 3238, 3245, 3246, 3260, 3262, 3265, 3280, 3284, 3285, 3286, 3288, 3420, 3422, 3424, 3425, 3470, 3474, 3476, 3478, 3480, 3484, 3485, 3486, 3502, 3504, 3508, 3560, 3565, 3566, 3568, 3660, 3662, 3664, 3668, 3680, 3685, 3686, 3740, 3742, 3746, 3750, 3758, 3782, 3814, 3815, 3892, 3894, 3895, 3896, 3950, 3952, 3956, 3958, 3974, 3975, 3978, 3990, 3992, 3996, 3998, 4030, 4032, 4038, 4060, 4062, 4064, 4080, 4084, 4085, 4086, 4088, 4100, 4102, 4142, 4148, 4160, 4165, 4166, 4180, 4182, 4184, 4185, 4188, 4190, 4192, 4198, 4302, 4304, 4305, 4308, 4310, 4312, 4316, 4318, 4380, 4382, 4412, 4414, 4415, 4416, 4430, 4432, 4436, 4438, 4470, 4472, 4476, 4478, 4532, 4534.

Some larger examples :