{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cscript type\u003d\u0027text/x-mathjax-config\u0027\u003eMathJax.Hub.Config({tex2jax: { inlineMath: [[\u0027$\u0027,\u0027$\u0027]] } }); \u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027 src\u003d\u0027https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\u0027\u003e\u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027\u003esetTimeout(function(){MathJax.Hub.Queue([\u0027Typeset\u0027, MathJax.Hub, \u0027left_view\u0027]);}, 2000);\u003c/script\u003e\n\u003cdiv class\u003d\"panel_content\"\u003e\n yd非常热爱数学,尤其对数字非常敏感,一天他在梦里找到一种有特殊性质的数,yd给它们取名叫yd数,现在他想让你帮他找找yd数。\n \u003cbr\u003e yd数有这样的性质:一个十进制数,如果是素数,而且它的各位数字和也是素数,则称之为“yd数”,如29,本身是素数,而且2+9 \u003d 11也是素数,所以它是yd数。 \n \u003cbr\u003e 给定一个区间,你能计算出这个区间内有多少个yd数吗? \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"第一行输入一个正整数T,表示总共有T组数据(T \u0026lt;\u003d 10000)。 \n\u003cbr\u003e接下来共T行,每行输入两个整数L,R(1\u0026lt;\u003d L \u0026lt;\u003d R \u0026lt;\u003d 1000000),表示区间的左值和右值。"}},{"title":"Output","value":{"format":"HTML","content":"对于每组数据,先输出Case数,然后输出区间内yd数的个数(包括端点值L,R)。 \n\u003cbr\u003e每组数据占一行,具体输出格式参见样例。"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e3\n1 100\n2 2\n3 19\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003eCase #1: 14\nCase #2: 1\nCase #3: 4\u003c/pre\u003e"}}]}