Assuming that pn is the nth prime number, establish each of the following statements:
(a) pn > 2n − 1 for n ≥ 5.
(b) None of the integers Pn= p1p2⋯pn + 1 is a perfect square.
[Hint: Each Pn is of the form 4k + 3 for n > 1.]
(c) The sum
is never an integer.
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