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New techniques for bounds on the total number of prime factors of an odd perfect number
Author(s):
Kevin
G.
Hare.
Journal:
Math. Comp.
76
(2007),
2241-2248.
MSC (2000):
Primary 11A25, 11Y70
Posted:
May 30, 2007
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Abstract:
Let denote the sum of the positive divisors of . We say that is perfect if . Currently there are no known odd perfect numbers. It is known that if an odd perfect number exists, then it must be of the form , where are distinct primes and . Define the total number of prime factors of as . Sayers showed that . This was later extended by Iannucci and Sorli to show that . This was extended by the author to show that . Using an idea of Carl Pomerance this paper extends these results. The current new bound is .
References:
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- 1.
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- 2.
- E. Z. Chein, An odd perfect number has at least 8 prime factors, Ph.D. thesis, Pennsylvania State University, 1979.
- 3.
- Graeme L. Cohen, Generalised quasiperfect numbers, Ph.D. thesis, University of New South Wales, 1982.
- 4.
- Graeme L. Cohen and Ronald M. Sorli, On the number of distinct prime factors of an odd perfect number, J. Discrete Algorithms 1 (2003), no. 1, 21-35, Combinatorial algorithms. MR 2016472 (2004h:11003)
- 5.
- Peter Hagis, Jr., Outline of a proof that every odd perfect number has at least eight prime factors, Math. Comp. 35 (1980), no. 151, 1027-1032. MR 572873 (81k:10004)
- 6.
- -, Sketch of a proof that an odd perfect number relatively prime to
has at least eleven prime factors, Math. Comp. 40 (1983), no. 161, 399-404. MR 679455 (85b:11004) - 7.
- Kevin G. Hare, More on the total number of prime factors of an odd perfect number, Math. Comp. 74 (2005), no. 250, 1003-1008 (electronic). MR 2114661 (2005h:11010)
- 8.
- D. E. Iannucci and M. Sorli, On the total number of prime factors of an odd perfect number, Math. Comp. 72 (2003), no. 244, 2077-2084. MR 1986824 (2004b:11008)
- 9.
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. II, Math. Comp. 40 (1983), no. 161, 405-411. MR 679456 (84d:10009) - 10.
- Pace P. Nielsen, Odd perfect numbers have at least nine distinct factors, Math. Comp. (to appear).
- 11.
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- 12.
- Carl Pomerance, Odd perfect numbers are divisible by at least seven distinct primes, Acta Arith. 25 (1973/74), 265-300. MR 0340169 (49:4925)
- 13.
- M. Sayers, An improved lower bound for the total number of prime factors of an odd perfect number, Master's thesis, New South Wales Institute of Technology, 1986.
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Additional Information:
Kevin
G.
Hare
Affiliation:
Department of Pure Mathematics, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
Email:
kghare@math.uwaterloo.ca
DOI:
10.1090/S0025-5718-07-02033-9
PII:
S 0025-5718(07)02033-9
Keywords:
Perfect numbers,
divisor function,
prime numbers
Received by editor(s):
July 25, 2005
Received by editor(s) in revised form:
October 10, 2005
Posted:
May 30, 2007
Additional Notes:
The research of the author was supported in part by NSERC of Canada.
Copyright of article:
Copyright
2007,
by the author
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