This number is neither prime nor composite.

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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: 2019-01-08 18:03:06.
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