24 = hours
   60 = minutes
   7 = days
   so I'm only off by a factor of 2^3.3, not by a factor of 2^9.3
   Cheers.

   On Mon, Dec 8, 2014 at 3:23 AM, Joseph Birr-Pixton
   <[1]jpixton@gmail.com> wrote:

     On 8 December 2014 at 10:40, Ryan Carboni <[2]ryacko@gmail.com>
     wrote:
     > [3]https://blockexplorer.com/q/hashestowin
     > log(171833398380382098659*24*60*7)/log(2)
     I think your calculation is slightly off. hashestowin is the average
     number of hashes you need to perform to win the current block. It's
     not necessarily the case that a block is calculated each second: in
     fact one is found (on average) each 625 seconds[1].
     So that gives:
     >>> log(171833398380382098659*24*60*7/625)/log(2)
     71.23
     Cheers,
     Joe
     [1] [4]https://blockexplorer.com/q/interval

References

   1. mailto:jpixton@gmail.com
   2. mailto:ryacko@gmail.com
   3. https://blockexplorer.com/q/hashestowin
   4. https://blockexplorer.com/q/interval