Most efficient O(1)
There are just 4 numbers which satisfy this condition. TC->O(1)\n\nclass Solution {\n    public boolean isFascinating(int n) {\n        return n == 192 || n == 
There are just 4 numbers which satisfy this condition. TC->O(1)\n```\nclass Solution {\n    public boolean isFascinating(int n) {\n        return n == 192 || n == 219 || n==273 || n==327;\n    }\n}\n```
['Java']