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Wikipedia: Dr. John B. Cosgrave (January 5, 1946) is an Irish mathematician specialising in number theory. He is best known for his series of discoveries in mathematics, including a new, 2000-digit prime number in 1999 and a record composite Fermat number in 2003. Cosgrave was born in Bailieborough, County Cavan to Sean Cosgrave and Annie Sandes, both primary school teachers.
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