86,243/Mistake

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Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary
$2^{86243} - 1$


1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary
$2^{86,243} - 1$


Mistake

... the $28$th Mersenne prime, hunted down by David Slowinski on his trusty CRAY-1 in $1983$.


The date he actually found this was in fact $25$ September $1982$.

However, he delayed announcing this result until after he had officially received permission to actually begin the search (which, at that point, had already been under way for some time).


Sources