Thread: Numbered Triangle: (lack of)Prime Patterns
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Old 08-01-2007, 10:24 AM
jay_shark jay_shark is offline
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Default Re: Numbered Triangle: (lack of)Prime Patterns
The formula for the ith row jth column should be :

ic2+j = (i-1)(i-2)/2 + j for i>1 and j for i=1 ;i>=j

ie 6th row 3 column is 6c2+3 = 18

3row 2 column is 3c2+2 = 5
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