Mersenne Number whose Index is Mersenne Prime/Mistake

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Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary
$8191$


Mistake

It had been conjectured that although most Mersenne numbers appear to be composite, a Mersenne number whose index was prime would itself be prime.


Correction

The correct wording of the end of this sentence is:

... a Mersenne number whose index was a Mersenne prime would itself be prime.


This has been corrected in Curious and Interesting Numbers, 2nd ed. of $1997$.


Sources