Monday, 16 September 2019

Prime


Let x be an integer of the form x=111⋯11⏟ntimes Show that, if x is prime then n is 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, ...