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This prime starts the largest known Cunningham chain of length 12 as of 2008: (8428860*127# + 212148902055090) * 2^n + 1, for n = 0 to 11. It also contains the largest known chain of length 11 which was actually the goal. There just happened to be a 12th prime. The chains are of the second kind. [Andersen]
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