3391382115599173

Just showing those entries submitted by 'Blanchette': (Click here to show all)

+ If you place this prime in a 4-by-4 array, i.e.,

   3   3   9   1
3 8 2 1
1 5 5 9
9 1 7 3
then each row, column, and the main diagonal form a 4-digit prime in both directions. [Blanchette]

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