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| Prime Sum Sudoku https://www.calcudoku.org/forum/viewtopic.php?f=20&t=1313 |
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| Author: | quadrata |
| Post subject: | Prime Sum Sudoku |
This one's a bit more challenging, but the rules are still simple. The clues hint at both which cells contain primes, and when sums of entries are prime. More info, a solution, and a PDF version at the following link: https://quadratablog.blogspot.com/2021/ ... udoku.html 
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| Author: | jaek |
| Post subject: | Re: Prime Sum Sudoku |
This is pretty clever. I haven't given it a lot of thought but it seems to have its own solving strategies. If a 2-circle implies that one of the cells must be 2 since its the only even prime. Similarly, a 0-circle implies that one of the cells must be 9 since its the only odd composite number less than 10. |
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| Author: | quadrata |
| Post subject: | Re: Prime Sum Sudoku |
Thanks for the compliment! Yes, there's definitely some new tricks I needed to come up with to make and solve these. One interesting tidbit, is that I couldn't do the same sort of thing for differences at all (without getting tons of extra unwanted solutions.) There's a delicate balance that allows a single solution to sneak out in this sum case. |
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