# Cunningham Chain

Computer Science Level pending

A Cunningham chain of length $$n$$ is a sequence of prime numbers such that for all $$1<i\leq n$$, $$p_i = 2p_{i-1}-1$$. For example, the sequence $$2,3,5$$ is a Cunningham chain of length 3.

Consider the smallest Cunningham chain of length 8. What is its last term?

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