# [J], 7 bytes

    1234567

[Try it online!][TIO-krd5cgyk]

[J]: http://jsoftware.com/
[TIO-krd5cgyk]: https://tio.run/##y/qfmpyRr6Ckp2CgYAXEunoKzkE@bv8NjYxNTM3M/2v@BwA "J – Try It Online"

Outputs `1234567` (obviously). Cracked solution should output `76390` instead.