Matches in DBpedia 2014 for { ?s ?p Hans Ivar Riesel (born 1929 in Stockholm) is a Swedish mathematician who discovered the 18th known Mersenne prime in 1957, using the computer BESK: this prime is 23217-1 and consists of 969 digits. He held the record for the largest known prime from 1957 to 1961, when Alexander Hurwitz discovered a larger one. Riesel also discovered the Riesel numbers. After having worked at the Swedish Board for Computing Machinery, he was awarded his Ph.D.. }
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- Hans_Riesel comment "Hans Ivar Riesel (born 1929 in Stockholm) is a Swedish mathematician who discovered the 18th known Mersenne prime in 1957, using the computer BESK: this prime is 23217-1 and consists of 969 digits. He held the record for the largest known prime from 1957 to 1961, when Alexander Hurwitz discovered a larger one. Riesel also discovered the Riesel numbers. After having worked at the Swedish Board for Computing Machinery, he was awarded his Ph.D.".