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The example on https://github.com/geonnave/primg shows a binary number ending with zero; doesn't that mean it's even, and therefore divisible by 2?

If you decrease the binary number by 1, it becomes prime. Perhaps it's this bug:

It is indeed! Haven't noticed the binary was wrong too.

Hmm, that screenshot is from first tests, it is clearly a bug -- but hopefully fixed now :)