# [Japt](https://github.com/ETHproductions/japt/), <s>12</s> 11 bytes Takes input as an array of digits, outputs `1` or `0`. xÈ*31sgYÃvA [Try it](https://ethproductions.github.io/japt/?v=1.4.5&code=eMgqMzFzZ1nDdkE=&input=WzYsOSwxLDYsNSw0LDMsMF0=)