Oops, Antennaman is the huygen, got it.
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I checked Wikipedia (Golbach's conjecture). It says it has been shown to be true for up to 4×(10)^18 but the conjecture "remains unproven despite considerable effort". I don't know if that number was rounded, or if they stopped the proof exactly at that number and then decided to let someone else keep working from there. Anyway, I think that's big enough for any moves I plan to make in this game (most likely).
16...x(5,5)