@starsandrobots p^2-1=(p+1)(p-1). p=odd, so p+1&p-1 even w/ one =0%4, so factor 8. p not divis. by 3, so one of (p+1, p-1) divis 3. 8*3=24
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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@starsandrobots The real trick is doing it in 140 characters or less.Thanks. Twitter will use this to make your timeline better. UndoUndo
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