--- id: 5900f4b71000cf542c50ffca challengeType: 5 title: 'Problem 331: Cross flips' videoUrl: '' localeTitle: '' --- ## Description undefined ## Instructions undefined ## Tests ```yml tests: - text: '' testString: 'assert.strictEqual(euler331(), 467178235146843500, "euler331() should return 467178235146843500.");' ``` ## Challenge Seed ```js function euler331() { // Good luck! return true; } euler331(); ``` ## Solution ```js // solution required ```
euler331()