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NoticeI 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 #30Category: Sudoku 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
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