Almost perfect number

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1	How Euler Did It by Ed Sandifer Odd Perfect Numbers November 2006 The subject we now call “number theory” was not a very popular one in the 18th century. Euler wrote almost a hundred papers on the subject, but the fi Add to Reading List Source URL: eulerarchive.maa.org Language: English - Date: 2013-11-04 12:20:24 Integer sequences Number theory Divisor function Algebraic number theory Perfect number Modular arithmetic Amicable numbers Divisor Prime number Quadratic reciprocity Leonhard Euler Coprime integers
2	Colouring Graphs When the Number of Colours is Almost the Maximum Degree∗ Michael Molloy Dept of Computer Science, University of Toronto 10 Kings College Rd. Toronto, ON, Canada, M5S 3G4 Add to Reading List Source URL: www.cs.toronto.edu Language: English - Date: 2011-01-05 22:31:04 Graph coloring Graph theory Graph operations Clique Degree Neighbourhood Graph Perfect graph theorem Extremal graph theory
3	n = pa1 1 pa2[removed]pat t with p1 , . . . , pt distinct primes and p1 > . . . > pt . • p1 >[removed]from Jenkins [5], improving on Hagis and Cohen [10] • p2 >[removed]from Iannucci [9], improving on Pomerance [19 Add to Reading List Source URL: math.crg4.com Language: English - Date: 2006-01-29 18:06:46 Perfect number Carl Pomerance Multiply perfect number Almost perfect number Prime number Jacques Touchard Number Integer sequences Mathematics Divisor function