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May 14, 2015 at 21:05 comment added GH from MO Density one is an old result, about 75 years old. By more elaborate techniques it is even known that up to $x$ there are only $O(x^{2/3})$ exceptions to Goldbach's conjecture (Pintz, unpublished). Establishing the existence of $C$ or bounding it (assuming its existence) is another matter. But who knows, maybe more breakthroughs are around the corner.
May 14, 2015 at 21:00 comment added Sylvain JULIEN I read somewhere (wikipedia?) that it has been proven that the set of Goldbach numbers has natural asymptotic density one, so maybe an explicit value for $C$ is attainable.
May 14, 2015 at 20:55 comment added GH from MO I think it would be a fantastic result if we could prove that the existence of $C$ implies a concrete value for $C$. This result is not in the literature, so it is fair to say that it is not possible to make $C$ explicit with current technology. Of course any new paper might change this opinion, e.g. Zhang and Maynard-Tao also used existing technologies, but noone believed a few years ago that their results were within reach.
May 14, 2015 at 20:34 history asked Sylvain JULIEN CC BY-SA 3.0