I was going to suggest, as usual, that you use Math::Pari and the function isprime(), but your clever adjust method skips so many cases that even the brute-force prime checker you have is good enough. Math::Pari only buys you a fraction of a second.

In reply to Re: Rotationally Prime Numbers Revisited by tall_man
in thread Rotationally Prime Numbers Revisited by Limbic~Region

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