Divide et impera units8/29/2023 ![]() While rather a silly question, I used the opportunity to talk about a field of Mathematics called Modular Arithmetic something that is important in many areas. The genesis of this piece is an answer that I wrote to the question “How is 51 not a prime number?”, which was posted on Q&A site. I have covered these concepts in other work, but include some basic background here as well. This brief article is about Prime and Composite numbers and, more specifically, trick that many people learn to test whether or not a number is a multiple of three.
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