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D. Shanks estimated in 1961 that the number of primes of the form n4 + 1 with n less than or equal to N is approximately 0.66974 li(N) where li(N) is the logarithmic integral. [Post]


  Submitted: 2005-03-31 14:54:53;   Last Modified: 2008-01-30 11:28:00.

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