Hmmm...
At first I thought this was unlikely because all 10 of the exponents were assigned to me for the bit levels 71-75. For 7 of the exponents, I completed 1 or 2 bit levels with no factors found, indicating that the ranges weren't partially cleared.
But poking around, it looks like Bill Staffen was reporting no factor ranges like "no factor from 2^71 to 2^74", so presumably an unreported found factor wouldn't clear the lower bit levels in the range.
Sorry, Bill!
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