How to write an algorithm for merging and expanding two numbers?

Question

Mathematics

There are two numbers, the first from the range 1-255 (1 byte) and the second (1-65535) 2 bytes, I used the following resources:

• first
  
• second
  

But the numbers are mainly obtained from the uint32 digit, but it needs to be from the uint16 range with the ability to get two numbers back.

Answer 1

If you manage to cram three bytes into two, don't forget to patent the algorithm.

Answer 2

Unable to solve your problem. You have 65535 * 255 input data options and, according to the condition, they should produce different values. The total number almost falls short of 2 ^ 24 - which means that it cannot be put into 16 bits.