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~~# [BQN], 31 bytes~~
~~{1+(1=𝕩)◶𝕊‿¯1(2|𝕩)⊑(𝕩÷2)∾1+3×𝕩}~~
[Try it online!][TIO-ktkck6vv]
[BQN]: https://mlochbaum.github.io/BQN
~~[TIO-ktkck6vv]: https://mlochbaum.github.io/BQN/try.html#code=RuKGkHsxKygxPfCdlakp4pe28J2ViuKAv8KvMSgyfPCdlakp4oqRKPCdlanDtzIp4oi+MSszw5fwnZWpfQoKRsKoMSvihpUxMAo=~~
An anonymous function which takes a number.
the `¯1` branch is a bit tacky but saves a byte over `(1+𝕊)`.

# [BQN], ~~31~~ 28 bytes
{1+(1≠𝕩)◶¯1‿𝕊2(|⊑÷˜∾1+3×⊢)𝕩}
[Try it online!][TIO-ktkck6vv]
[BQN]: https://mlochbaum.github.io/BQN
[TIO-ktkck6vv]: https://mlochbaum.github.io/BQN/try.html#code=RuKGkHsxKygx4omg8J2VqSnil7bCrzHigL/wnZWKMih84oqRw7fLnOKJjTErM8OX4oqiKfCdlal9CgpGwqgxK+KGlTEw
An anonymous function which takes a number.
the `¯1` branch is a bit tacky but saves a byte over `(1+𝕊)`.