January 03 to January 13 - PrimeGrid's 2017 Challenge Series: Isaac Newton's Birthday Challenge
The first Challenge of the 2017 Challenge series is a 10 day challenge to celebrate Isaac Newton's 374th Birthday! The challenge is being offered on PrimeGrid's newest sieve, the Generalized Cullen/Woodall (Sieve) application. Come join us and help in preparations for the opening of the Generalized Cullen/Woodall LLR project some time in 2017.

Sir Isaac Newton was an English physicist and mathematician (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations for classical mechanics. Newton made seminal contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for the development of calculus.

Newton's Principia formulated the laws of motion and universal gravitation, which dominated scientists' view of the physical universe for the next three centuries. By deriving Kepler's laws of planetary motion from his mathematical description of gravity, and then using the same principles to account for the trajectories of comets, the tides, the precession of the equinoxes, and other phenomena, Newton removed the last doubts about the validity of the heliocentric model of the Solar System.

Newton built the first practical reflecting telescope and developed a theory of colour based on the observation that a prism decomposes white light into the many colours of the visible spectrum. He formulated an empirical law of cooling, studied the speed of sound, and introduced the notion of a Newtonian fluid. In addition to his work on calculus, as a mathematician Newton contributed to the study of power series, generalised the binomial theorem to non-integer exponents, developed a method for approximating the roots of a function, and classified most of the cubic plane curves.

On January 4, 1643, Isaac Newton was born at Woolsthorpe Manor in the hamlet of Woolsthorpe-by-Colsterworth, in the county of Lincolnshire, England (using the "old" Julian calendar, Newton's birth date is sometimes displayed as December 25, 1642).

To participate in the Challenge, please select only the Generalized Cullen/Woodall (Sieve) project in your PrimeGrid preferences section. The challenge will begin 3rd January 2017 18:00 UTC and end 13th January 2017 18:00 UTC.
PrimeGrid's Forum about this project challenge
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January 08 to January 12 - CRUNCHATHLON PG [MONTHLY RUN - RACE IX]
This team challenge issued by the French team CRUNCHERS SANS FRONTIERES takes place every month at varying dates for four days. All teams are welcome Let us take forward the PrimeGrid project! Keep crunching primes and keep sieving factors! Visit their website: https://www.crunchersansfrontieres.org
NB: All PrimeGrid sub-projects count for this challenge!

CRUNCHATHLON PG IX chat and stats page