Curtis Niles Cooper is an American
mathematician. He currently is a professor at the
University of Central Missouri, in the Department of Mathematics and Computer Science.
GIMPS
Using software from the
GIMPS project, Cooper and Steven Boone found the 43rd known
Mersenne prime on their 700
PC cluster
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on December 15, 2005. The prime, 2
30,402,457 − 1, is 9,152,052 digits long and is the ninth Mersenne prime for GIMPS.
Cooper and Boone became the first GIMPS contributors to find two primes when they also found the 44th known Mersenne prime, 2
32,582,657 − 1 (or M
32,582,657), which has 9,808,358 digits . This prime was discovered on September 4, 2006 using a PC cluster of over 850 machines. This is the tenth Mersenne prime for GIMPS.
On January 25, 2013, Cooper found his third Mersenne prime of 2
57,885,161 − 1.
On September 17, 2015, Cooper's computer reported yet another Mersenne prime, 2
74,207,281 - 1, which was the
largest known prime number at 22,338,618 decimal digits. The report was, however, unnoticed until January 7, 2016.
Areas of research
Cooper's own work has mainly been in elementary
number theory, especially work related to digital representations of numbers. He collaborated extensively with Robert E. Kennedy. They have worked with
Niven number Niven is a surname. It is derived from the Scottish Gaelic ''Mac Cnaimhin''.#H1, Hanks; Coates; McClure (2016) p. 1941.
Notable people
*Archibald C. Niven, US politician
* Alan Niven, rock n roll composer, producer and manager Guns n Roses, Great W ...
s, among other results, showing that no 21 consecutive integers can all be Niven numbers, and introduced the notion of
tau number
A refactorable number or tau number is an integer ''n'' that is divisible by the count of its divisors, or to put it algebraically, ''n'' is such that \tau(n)\mid n. The first few refactorable numbers are listed in as
: 1, 2, 8, 9, 12, 18, ...
s, numbers whose total number of divisors are itself a divisor of the number. Independent of Kennedy, Cooper has also done work about generalizations of
geometric series, and their application to
probability.
[.]
Cooper is also the editor of the publication ''
Fibonacci Quarterly''.
Notes
External links
*
Curtis Cooper's homepage
Living people
Iowa State University alumni
University of Central Missouri faculty
21st-century American mathematicians
Number theorists
Year of birth missing (living people)
Place of birth missing (living people)
Mathematicians from Missouri
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