--- id: 5900f3e41000cf542c50fef7 challengeType: 5 title: 'Problem 120: Square remainders' videoUrl: '' localeTitle: 问题120:方形剩余部分 --- ## Description 设r是(a-1)n +(a + 1)n除以a2时的余数。例如,如果a = 7且n = 3,则r = 42:63 + 83 =728≡42mod 49.并且当n变化时,r也将变化,但是对于a = 7,结果是rmax = 42。对于3≤a≤1000,找到Σrmax。 ## Instructions ## Tests ```yml tests: - text: euler120()应返回333082500。 testString: 'assert.strictEqual(euler120(), 333082500, "euler120() should return 333082500.");' ``` ## Challenge Seed ```js function euler120() { // Good luck! return true; } euler120(); ``` ## Solution ```js // solution required ```
euler120()