I didn't check the calcs, basically because I don't have the knowledge to do so, BUT:
Isn't this a more metaphisical question? I mean: Riesel Sieve is probably going to be finished when our grandchildren get old, if there are still grandchildren at this time. I feel it more like the building of a cathedral, where you know that you don't see the finished work, but you do it anyways.
So my answer to that question if man will ever know if there is such a cullen prime, is: Perhaps. But he has to try.
Yours H.
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