Good Year ...
Yeah, I know ... but I think it's very bad start!
superstitious .. I know.
In all cases several mathematical properties are noteworthy:
1) 2011 is a prime number .. and yes
2) 2011 is the sum of 11 consecutive primes
2011 = 157 +163 +167 +173 +179 +181 +191 +193 +197 +199 + 211
3) 2011 multiplied by the symmetric (1102) is a palindrome
that is to say a number that does not change when 'it is read from right to left or left to right
2011 x 1102 = 2216122
4) The least double in 2011 1 is still a prime number.
2011 x 2 - 1 = 4021
5) Figures of 2011 is a perfect square. Similarly, the sum of the square of 2011 is also a perfect square
2 +0 +1 +1 = 4 = 2 ² ²
2011 = 4,044,121 ==> 4 +0 +4 +4 +1 +2 + 1 = 16 = 4 ²
6) Properties Troubling
will 13/05/2011 The Friday the 13th. Well, this is not something exceptional
By cons, if sums the counts of 13052011, there are still 13 ... This is called a "double Friday 13 "
on Good, Happy New Year! And
avoid breaking a mirror Friday, May 13, 2011 because a black cat scares you will fall by the scale below which he passed ... because I will not answer for anything!
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Source: encyclopedia of integer sequences .
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