{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"\n \u003cp class\u003d\"tw-paragraph tw-block\"\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003eChúng ta gọi một số \"Nguyên tố truong gương\" khi nó là một số nguyên tố và khi viết ngược lại nó vẫn là số nguyên tố.\u003c/span\u003e\u003c/p\u003e\n \u003cp class\u003d\"tw-paragraph tw-block\"\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003eTìm số lượng số \"Nguyên tố trong gương\" từ \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003ea\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e đến \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003eb\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e.\u003c/span\u003e\u003c/p\u003e\n \u003cimg src\u003d\"CDN_BASE_URL/3decd531fe59b581b922cc7a75a01126?v\u003d1685101865\" alt\u003d\"\" title\u003d\"\"\u003e\n"}},{"title":"Input","value":{"format":"MD","content":" \u003cp class\u003d\"tw-paragraph tw-block\"\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003eHai số \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003ea\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e và \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003eb\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e (\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003e1\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e ≤ \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003ea\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e ≤ \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003eb\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e ≤ \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003e10000\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e).\u003c/span\u003e\u003c/p\u003e\n"}},{"title":"Output","value":{"format":"MD","content":"\n \u003cdiv\u003e\n \u003cp class\u003d\"tw-paragraph tw-block\"\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003eIn số các số \"Nguyên tố trong gương\" trong khoảng \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003ea\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e tới \u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline tw-style-bold\"\u003eb\u003c/span\u003e\u003cspan class\u003d\"tw-text tw-inline\"\u003e.\u003c/span\u003e\u003c/p\u003e\n \u003c/div\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"Sample 1","value":{"format":"MD","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e10 25\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}