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J, 17 bytes {{*./y|~*:2+i.y}} Try it online! A direct definition closest to Razetime's infuriatingly good train solution. Outputs a non-zero number for true and 0 for false.
Answer
#1: Initial revision
by
south
·
2022-02-15T22:16:07Z (over 2 years ago)
# [J](https://jsoftware.com/#/), 17 bytes
```J
{{*./y|~*:2+i.y}}
```
[Try it online!](https://tio.run/##y/r/P83WSsFYwUpBXUtPv7KmTsvKSDtTr1KdKzU5I1/BTkEjWidNUyE1MTlDQcPOKlPP0EBTR8HQSFtDuS7aSlfPSK1GEyT4/z8A)
A direct definition closest to Razetime's infuriatingly good train solution. Outputs a non-zero number for true and 0 for false.