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 2019-12-24, 16:56 #6 mart_r     Dec 2008 you know...around... 67710 Posts Been re-reading "Prime number races" by Granville and Martin and "Cramér vs. Cramér" by Pintz again, also some of Maier's work. (The more I read it, the better I understand it.) Conclusion: Might as well go with $M\hspace{1}=\hspace{1}Ri(p'+\frac{q}{4})-Ri(p+\frac{q}{4})$ It's close enough to what I previously thought was the most accurate way of measuring the merit and quite easy to calculate. A trade-off, so to speak. q=188940 / p=8356739 / g=76*q qualifies as CSG>1 even by g/log²(p')/$\varphi(q)$ If anyone's interested, I'll post a more exhaustive list of gaps with CSG>1 when measured by the above formula.