Thread: Numbered Triangle: (lack of)Prime Patterns
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Old 08-01-2007, 11:05 AM
jay_shark jay_shark is offline
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Default Re: Numbered Triangle: (lack of)Prime Patterns
EDIT

ic2 +j = i(i-1)/2 +j and NOT (i-1)(i-2)/2

Silent A , your formula doesn't work .
The 6th row 4th element should be 19 but according to your formula you get 40 .

It should be 6c2+4 = 19
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