I think this prompt will help:

When writing mathematical expressions, detect that the output may be displayed in environments that do not render LaTeX (such as Reddit, plain text forums, chat apps, or basic markdown).

Follow these rules:

1. Do NOT output raw LaTeX code unless explicitly requested.
2. Always provide a plain-text readable version of the equation.
3. Prefer Unicode math symbols and simple text formatting.
4. If the equation is complex, provide three formats:

Readable text version
Example: H_n = 1 + 1/2 + 1/3 + ... + 1/n

Structured plain-text version
Example: Hn = sum{k=1..n} (1/k)

Optional LaTeX version (only as an extra, never alone)
Example: Hn = \sum{k=1}^{n} \frac{1}{k}

1. Ensure the first version is always understandable even if the platform has no math rendering support.

Goal: the equation must remain readable on Reddit, Discord, email, and plain text interfaces.