Write 25 in binary: 11001.
Interpret that as if it was in ternary: 3⁴+3³+1 = 109, a prime number!
What other composite numbers does it work for?
I quickly realised that it has to be odd, and furthermore, has to give an irreducible polynomial if you interpret it in base x (e.g. 11001 →𝑥⁴+𝑥³+1) […]
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