Worked on the OI-wiki/OI-wiki repository, focusing on improving the accuracy of mathematical documentation rather than delivering new features. Addressed a critical issue by correcting a typo in the factorial formula related to prime modulus calculations, ensuring that reference materials provide reliable guidance for users. The technical approach involved careful review and revision of Markdown-based documentation, applying mathematical expertise to clarify complex number theory concepts. This update reduces the risk of misinterpretation and incorrect implementations by users, ultimately lowering support overhead. Demonstrated attention to detail and a commitment to documentation quality, leveraging skills in mathematics and technical writing throughout the process.