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    $\begingroup$ Brilliant work! If you want an extra challenge, try finding a solution where all primes are less than 70. $\endgroup$ Commented Aug 3, 2022 at 14:46
  • $\begingroup$ absolutely amazing. $\endgroup$
    – JLee
    Commented Aug 3, 2022 at 15:41
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    $\begingroup$ This looked like an answer of the form 'I wrote a computer program and this is the solution' but you actually provided a strategy and a solution that can be found with pen and paper. Well done. $\endgroup$
    – quarague
    Commented Aug 4, 2022 at 8:55
  • $\begingroup$ @quarague I didn't write a program, but I used an Excel spreadsheet to help me with this by calculating the result boards from the moves I entered. The numbers in my post were basically copy/pasted directly from the spreadsheet. $\endgroup$ Commented Aug 4, 2022 at 11:12