Michael Shafer

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Michael Shafer discovered the 40th Mersenne prime, 220,996,011-1 at GIMPS project.

Shafer joined GIMPS in November 2000. At the time of discovery, on 2003-11-17, he was 26-year old and lived in Lansing, Michigan with his wife Liz Shafer. He was a chemical engineering graduate student at Michigan State University.

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