Problems & Puzzles: Problems Problem 15.- Why the Twin Constant is so close to 2/3? Marek Wolf (17/11/98) has proposed the following problem: "Is there any (heuristic) reason why the value of the twin constant C2=0.66016... is so close to 2/3?" C2 is called the "twin prime constant" and is the infinite product: C2 = Product {1 1/(p-1)2 }, for p>2. Wrench calculated first this constant in 1961. A modern value is this: 0.660161815846869573927812110014555778432623360 See:
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