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Jul 12, 2020 at 15:38 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 16:00 comment added Andreas Weingartner Yes, the last display of my answer shows that $x<q=p_{N+1}$. Using the ceiling instead of rounding will always work if $2k \ge 0.71 \, p_N$, but will fail at twin primes if $2k\le 0.38 \, p_N$.
Jul 11, 2020 at 15:48 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 15:42 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 15:01 vote accept Agno
Jul 11, 2020 at 14:59 comment added Agno Many thanks, Andreas! One more observation that could maybe help sharpening these bounds. Numerical evidence suggests (I have no proof) that when $k$ increases, $x$ always approaches $p_{N+1}$ from 'below'. So, if this is true, could using the ceiling instead of rounding $x$ improve the bound by a factor $2$?
Jul 11, 2020 at 4:56 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 4:27 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 4:09 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 1:29 history edited Andreas Weingartner CC BY-SA 4.0
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Jul 11, 2020 at 1:22 history answered Andreas Weingartner CC BY-SA 4.0