--- id: 5900f4451000cf542c50ff57 challengeType: 5 title: 'Problem 216: Investigating the primality of numbers of the form 2n2-1' videoUrl: '' localeTitle: '' --- ## Description undefined ## Instructions undefined ## Tests ```yml tests: - text: '' testString: 'assert.strictEqual(euler216(), 5437849, "euler216() should return 5437849.");' ``` ## Challenge Seed ```js function euler216() { // Good luck! return true; } euler216(); ``` ## Solution ```js // solution required ```
euler216()