Mersenne: If I Remember Correctly... (hah)

[STL137]

<<I believe the world record was around 40,000 digits.>>

Right you are.  My trusty 1994 Guiness Book of World Records puts it at 
exactly 40k, by Hideaki Tomoyori, in 17hr 21min (including 4hr 15min of 
breaks).

S. "I'm so old, my memory's failing me already" L.
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