Primes rule and if you don't agree - take it up with Optimus!
Maths Matters #31
Because 31 = 2 to the power of 5 – 1, it is the third Mersenne prime. Almost all of the largest prime numbers ever discovered are Mersenne primes. Mersenne primes are primes equal to 2 to the power of p – 1, where p is a prime). They take their name from a French scholar, Marin Mersenne, who studied them in the early 17th century. The 48th Mersenne prime, discovered in January 2013, is 2 to the power of 57,885,161 – 1. It has 17,425,170 digits and if typed out in the same font as the Harry Potter books, would run to about 5000 pages. Check out Adam Spencer, comedian and lifelong math fanatic, discussing `monster' prime numbers at http://bit.ly/19RvlHE if you have a spare ¼ of an hour with which to amuse yourself.
Quiz Question: Is 2 to the power of 31-1 prime or composite?
Quiz Answer #30: 7# = 7 x 5 x 3 x 2 = 210, 11# = 11 x 7 x 5 x 3 x 2 = 2310, and 13# = 13 x 11 x 7 x 5 x 3 x 2 = 30030, which of course ties in with last week’s featured number of 30!