Revision ad4143f2-6e50-4625-b694-db23fa9bd1ad - Code Golf Stack Exchange
# [J], <sup>13</sup> 7 bytes
_&q:inv
[Try it online!][TIO-klx2din6]
[J]: http://jsoftware.com/
[TIO-klx2din6]: https://tio.run/##3ZA9CgJBDIX7PcXDwkUYl8xPkpmBrQQrKy9gIS66hWLj9cdlxr2EIQm8F17xZS6boZ8wZvQwIORl9gMO59OxXLbv/Hh@yq7rutv1/oLFiAnUhKvCNqHcTgbWwDXPB13Nv@kfLqtUNFlZYxRmYR@Ddyl4SySagjIHJRepVY0kAzFQA66/issmlC8 "J – Try It Online"
As described [here](https://code.jsoftware.com/wiki/Vocabulary/qco#dyadic), the verb `_ q: n` returns the prime exponents of `n`. So the inverse `inv` of that verb is exactly what we want.