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Write a function f[n] that returns prime numbers contained between n and 2n. It's a variation of Chebyshev's inequality. Please, help.

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  • 2
    $\begingroup$ Do you know about Prime[] and PrimePi[]? $\endgroup$ – J. M. will be back soon Oct 14 '18 at 8:54
  • $\begingroup$ Is this a homework problem? If so, it should tagged as such. $\endgroup$ – m_goldberg Oct 14 '18 at 12:16
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n = 100;
Select[Prime[Range@@PrimePi[{n,2n}]],#>=n&]

returns

{101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199}
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n = 100;
Prime[Range @@ ({1 - Boole[PrimeQ[n]], 0} + PrimePi[{n, 2 n}])]

{101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199}

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