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Patrick posted his solution earlier this week. I figure it was time to add mine. Also, Octavio Hernandez pointed out in the comments to problem 8 that he had discussed similar code constructs in his blog a while back. Problem 10 asks for the sum of all primes less than 2 million. It's also one line...

Yes, it's true that I've been very lax in working on these problems. It's been a combination of the day job, finishing all the editing tasks on "More Effective C#", and actually trying to keep the personal life intact. The 7th problem is quite straightforward: find the 10,001st...

The second Euler problem asks you to find the sum of all even valued terms in the Fibonacci sequence which do not exceed 4,000,000. Let's look at the solution from the outside in. Here's the query that finds the answer: var EvenFibNumbers = (from n in Enumerable.Range(1, MAX) let value = FibonacciSequence...

I am starting a new series. A friend recently pointed me at the Project Euler problems. You can see the project here: http://projecteuler.net/ As I finish them, I'll post an explanation of the problem and the code here. I've also posted the code on MSDN Code Gallery. As I finish a week's...