One Liner💯 (Easiest)
\n # Intuition \n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \nI sort the input 
\n<!-- # Intuition -->\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\nI sort the input number in string and then matched with the desired outcome. \n\n# Code\n```js\nconst isFascinating = (n) => "123456789" === `${n}${n * 2}${n * 3}`.split("").sort().join("")\n```
['TypeScript', 'JavaScript']