#distributed project

[agileprojectmanagement]

Why Scrum Works – Agile Software Development Methodology

Why Scrum Works There are many project management systems in Agile, Scrum is one of them. Scrum is a project management working life cycle, and …

Why Scrum Works

There are many project management systems in Agile, Scrum is one of them. Scrum is a project management working life cycle, and mostly used in software developments. Often people think that scrum is a methodology but, actualy it is an Agile framework for managing the development processes. Scrum is a fastest  planning for working. It works more fast than others because it works on some favourable pattern, which we have discussed later down here. Scrum partite (divide) the work and is easy to understand.

Scrum is useful for team to communicate and coordinate with each others. Scrum is a structured programming and meeting style, which works well for Scrum team. Scrum has a simple but effective mechanism for tracking project progress.

There are a lot of reason which makes scrum work better than other programming framework. Few reasons are listed below and shortly discussed.

What is Scrum in Agile Methodology Read More...

[obis]

A077586 - 2^(2^p-1)-1

A077586 - 2^(2^p-1)-1

7, 127, 2147483647, ...

A double Mersenne number is a Mersenne number n = 2k-1 where k is a Mersenne prime. Since the first few Mersenne primes are k = 3, 7, and 31, the first double Mersenne numbers are those shown above. The next one is 2127-1, and after that is 22047-1. They quickly get very large.

But not all Mersenne numbers with a prime exponent are necessarily prime -- that's a necessary condition, but not a sufficient one. The first four double Mersenne numbers are, but the next three (MM13, MM17, MM19, MM31) are not. The next double Mersenne number, MM61, is certainly a candidate, but it's got 7 × 1017 digits, and no existing factoring method has yet been able to find any factors.

A distributed search for factors of higher double Mersenne number has been started, but due to the size of the numbers, it may be a very long time indeed until any of them are proven to be prime.

[obis]

A076336 - (Provable) Sierpinski numbers

A076336 - (Provable) Sierpinski numbers

78557, 271129, 271577, 322523, 327739, ...

In 1960, Wacław Sierpiński proved that there were infinitely many odd natural numbers k for which k2n + 1 was composite for every positive value of n. Two years later, John Selfridge proved that 78557 met this criteria (he was able to show that for any value of n, 78557 x 2n + 1 had at least one of a set of five prime factors). For the next five years, Selfridge and Sierpinski worked to find other numbers of this form, but could not prove than any lesser numbers met the criteria. In 1967, they conjectured that 78557 was the smallest.

By March 2002, there were 17 numbers smaller for which their status was unknown. Louis Helm at the University of Michigan and David Norris at the University of Illinois decided that instead of wait for proofs, they would start a distributed search for counter-examples. If they could find an n for all 17 candidates for which k2n + 1 was prime, they would prove the conjecture.

Over the past nine years, the project has narrowed the list to 6 candidates. You can join the search and help close the book on an unsolved problem in number theory.