Sunday, 20 October 2013

positive integers

Find all positive integers n for which 3n − 4, 4n − 5, and 5n − 3 are all prime.
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Define f:R→R by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...