Notice

I am no longer posting new puzzles to this blog. For all of my Sudoku puzzles, old and new, please visit Sudoku in another section of this website. I will still create and offer new puzzles, in batches of a couple of hundred, once a week or so.

Sudoku #30

Category: Sudoku
Fri, 22 Jul 2005, 10:03

What's special about the number 30? It's the product of the first three prime numbers. That is, 30=2x3x5. Products of prime numbers are called "primorials". The first ten primorials are: 2, 6, 30, 210, 2310, 30030, 510510, 9699690, 223092870, and 6469693230.

What's special about July 22? July 22, also written as "22/7", is known as "Pi Approximation Day", in honor of a commonly used approximation to the value of π. (Pi Day is celebrated on March 14.)

What's special about today's Sudoku puzzle? Nothing much, really. Like the other puzzles I post, this one requires the usual assortment of advanced solving techniques.

Hans

  5  
7    
4    
     
9   8
     
  3  
     
     
    1
2    
  9 6
2    
6   7
    5
4 5  
    9
2    
     
     
  1  
     
3   2
     
    8
    7
  9  

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