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| 8_Primes IV (Posted on 2013-11-06) |
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From this set of digits {1,1,2,4,7,9,9,9,9} allot one digit to each cell of a 3 x 3 array so that each column and major diagonal (read top-down) and row (read left-to-right) is a 3-digit prime number, resulting in 8 primes in all.
Then repeat the process using this set: {1,1,1,3,4,6,9,9,9}.
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Submitted by brianjn
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Solution:
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Without consideration of reflections I proposed:
No1.
4 9 9
1 2 7
9 9 1
No2.
6 1 9
3 4 9
1 9 1
These were derived manually within a spreadsheet.
Obviously from Charlie's Solution I either did not test thoroughly or made assumptions. I do note that his response does not negate reflections so, depending upon your expectations the solution set can be slightly less.
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