4423/Historical Note

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Historical Note on $4423$

The Mersenne number $M_{4423} = 2^{4423} - 1$ was demonstrated to be a Mersenne prime by Alexander Hurwitz on $3$ November $1961$, using an IBM 7090, along with $M_{4253}$, whose primality was similarly demonstrated in the same computer run.

These were the first titanic primes ever discovered.

It is a moot question which one was actually discovered first.