In this answer the OP of the question presented an alternative solution from github. The github repository shows that it uses the MIT license:

...

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

Which leads me to believe the user can post it as maintainer.

However at the end of the answer is this (which I modified for grammar and formatting):

• Checks if the condition -d*m%b%g == 0 is satisfied. This condition is related to finding a solution to the modular equation \$p*x + d*m ≡ 0 (mod b)\$ where \$x\$ is the repeating part. This is still a mystery for me, how does it work?

If this was posted in a question then I would vote to close because it would not be on-topic due to the OP not being able to answer all questions from that page- primarily:

• Am I an author or maintainer of the code?

  For licensing, moral, and procedural reasons, we cannot review code written by other programmers. We expect you, as the author, to understand why the code is written the way that it is.

Yet this code and question is contained in an answer. Is it okay for the OP to post this code in an answer even if they don't fully understand how it works?