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Happy mathematical new year: 2011 is the sum of 11 consecutive prime numbers
Posted by: Gary Ernest Davis on: January 1, 2011
- In: 2011
- 39 Comments
xOn December 31, 2010 @mathematicsprof posted two interesting tweets: @mathematicsprof FINALLY, a prime number year 2011 …. first one since 2003. x @mathematicsprof 2011 is also the sum of 11 CONSECUTIVE prime numbers: 2011=157+163+167+173+179+181+191+193+197+199+211 x Two prime numbers are “consecutive” if they follow one upon the other, in the collection of prime numbers. So, for […]
Multiplication of whole numbers, and how we think about it
Posted by: Gary Ernest Davis on: December 31, 2010
I want to take a – relatively minor – exception to Keith Devlin’s post, What Exactly is Multiplication?, on multiplication as repeated addition, and then largely agree with what he writes, with some amplification. Multiplication is a defined notion for whole numbers and is provably commutative Devlin claims that multiplication is not repeated addition and […]
