The RSA - A simple math example

First, I like to apologize for making a mistake in my last video - The RSA Cryptosystem. Step 3 should be decryption, not key generation. It is a big mistake. I apologize for causing some confusion.
Last time I talked about how the RSA works with math formulas. Today I will demonstrate how it works with one simple example.
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[sylvaincena]

Excuse me Prof i could not really get the meaning of coprime numbers with 14 in this context. For what i know a prime number has only 2 factors that is 1 and the number itself. Please i need further explanations on that part. Thanks🙏🙏🙏

[ArghyadeepPal]

Prof. Sun, is the Cryptography book by Prof. Forouzan recommended for this topic?

[vipermustang]

In your example, what would happen if we used a letter corresponding to a higher value for the encryption? Because it looks the inequality is not satisfied.

[Ethio-]

Great Video Lectures Ever.
From ETHIOPIA

[ostanin_vadym]

Thanks for the content. RSA more clear now.

[kharismawanakbar]

How about if plaintext its a long sentence?