Similar questions have been asked before regarding journals that publish:
- expository work,
- recreational mathematics,
- computational results,
- new proofs of old theorems,
- and even math textbooxs.
However, I did not find any references to journals that publish new mathematical identities. These might include new formulae for $\pi$, $e$, or other known constants that might be useful for researchers in a wide variety of fields.
After briefly looking through papers that contain expositions of new formulae, it would seem that the majority of these papers are given "as-is", i.e., as notes freely available on the webpage of the author. Are there no journals that publish such results?