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Riesel, Hans
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Hans Riesel
Hans Ivar Riesel
(May 28, 1929 in
Stockholm
– December 21, 2014) was a
Swedish
mathematician
who discovered the 18th
Mersenne prime
in 1957, using the computer
BESK
: this prime is 2
3217
-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 number
s as well as developing the
Lucas–Lehmer–Riesel test
. After having worked at the
Swedish Board for Computing Machinery
, he was awarded his
Ph.D.
from
Stockholm University
in 1969 for his thesis ''Contributions to numerical number theory'', and in the same year joined the
Royal Institute of Technology
as a senior lecturer and associate professor.
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1
Prime Numbers and Computer Methods for Factorization
by
Riesel
,
Hans
Published 2012
Birkhäuser
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2
Prime Numbers and Computer Methods for Factorization
by
Riesel
,
Hans
Published 1994
Birkhäuser
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