11,213/Historical Note

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Historical Note on $11 \, 213$

MersennePrime11213 Postmark.jpg

The Mersenne number $M_{11 \, 213} = 2^{11 \, 213} - 1$ was demonstrated to be a Mersenne prime by Donald Bruce Gillies on $2$ June $1963$ at the University of Illinois.

The University celebrated this event by using a special postmark to frank its letters.