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03-25-2003, 04:19 PM
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#1 | ||
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College Prospect
Join Date: Oct 2000
Location: Mountain View, California
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OT - Another prime square puzzle
This week's challenge: arrange the numbers 1 to 9 in a 3x3 matrix. Reading the matrix in any direction as 3-digit numbers (i.e. up/down, right/left or in either direction on the main diagonals), each of the numbers 1 to 9 must be used at least once in a 3-digit prime number.
Your score is the total number of 3-digit prime numbers in your 3x3 matrix. (There are 16 possible 3 digit numbers, but for obvious reasons, a score of 16 is impossible). My best score so far is 8 - can you do better? |
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03-25-2003, 05:00 PM
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#2 |
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Pro Starter
Join Date: Oct 2000
Location: The Internets
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I think I have one with 9 and I can't figure out a way to get more:
7 6 9 5 4 8 1 2 3
__________________
I do mind, the Dude minds. This will not stand, ya know, this aggression will not stand, man. - The Dude |
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03-25-2003, 05:02 PM
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#3 |
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College Prospect
Join Date: Oct 2000
Location: Mountain View, California
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Hmm, I see a problem with your grid - the number 2.
None of 642 246 123 321 are prime... Each number has to be used at least once in a 3-digit prime, sorry if the instructions are confusing.... |
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03-25-2003, 05:04 PM
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#4 |
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Pro Starter
Join Date: Oct 2000
Location: The Internets
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Damn it, I thought I finally got one of these stinkin puzzles.
__________________
I do mind, the Dude minds. This will not stand, ya know, this aggression will not stand, man. - The Dude |
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