{"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":"欧拉函数是数论中一种重要的函数,1∼N 中与 N 互质的数的个数被称为欧拉函数,记为 (N)。\n这里有一个非常简单的问题:假设给你a,b,试着计算(a)+(a+1)+...+(b)"}},{"title":"Input","value":{"format":"HTML","content":"有几个测试用例。每行有两个整数a,b(2 \u003c a \u003c b \u003c 3000000)。"}},{"title":"Output","value":{"format":"HTML","content":"输出(a)+(a+1)+...+(b)的结果"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e3 100\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e3042\u003c/pre\u003e"}}]}