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A heuristic estimate for the number of Sophie Germain primes less than x is C_{2} x / (log x)^{2} where C_{2} is the twin prime constant, approximately 0.660161. For x=10,000 an estimation gives us approximately 413 Sophie Germain primes, which is still too inaccurate.
A sequence {p, 2p+1, 2(2p+1)+1, ...} of Sophie Germain primes is called a Cunningham chain[?] of the first kind.
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