Curiosities about the number 2011

1. H a p p y N e w P r i m e Y e a r 2 0 1 1 ! Pilar Oliva

3. 2011 is a prime number too; it has no divisors,but...

4. 2, 3 , 5, 7, 11, 13 are the first six prime numbers

7. 2 is 10

8. 3 is 11

10. Because 4 = 1x2 2 + 0x2 1 + 0x1

11. Then think about the first day of the year.

12. 01/01/11

13. It is 010111 in base 2;what is its value in the decimal numeration system ?

14. 0x2 5 +1x2 4 +0x2 3 +1x2 2 +1x2 1 +1x1=23

15. 23 is also a prime number!

19. 55 is not a prime number, because it is a multiple of 5 and 11.