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Tag Archives: prime numbers
Find Mersenne primes in C#
Mersenne primes are prime numbers of the from 2n – 1 for some integer n. For example, 22 – 1 = 4 – 1 = 3 and 3 is prime, so 3 is a Mersenne prime. This example uses a … Continue reading
Posted in algorithms, mathematics
Tagged algorithms, C#, C# programming, example, example program, mathematics, Mersenne primes, prime numbers, primes, Windows Forms programming
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Use PLINQ to select prime numbers from an array in C#
The example Use PLINQ to select even numbers from an array in C# uses PLINQ (Parallel LINQ) to find the even numbers in an array of random values. This example uses a similar technique to do something slightly more interesting: … Continue reading
Use LINQ with an embedded lambda expression to find prime numbers in C# (Part 3 of 3)
The example Use more efficient LINQ to find prime numbers in C# (Part 2 of 3) uses a LINQ query to find prime numbers. It creates a delegate variable named IsOddPrime referring to a lambda expression and uses it to … Continue reading
Posted in algorithms, LINQ, mathematics
Tagged algorithms, C#, C# programming, example, example program, find prime numbers, lambda expression, LINQ, mathematics, prime numbers, Windows Forms programming
4 Comments
Use more efficient LINQ to find prime numbers in C# (Part 2 of 3)
The previous post showed how you can use LINQ to find prime numbers. For every number between 1 and a maximum, the LINQ query called the IsPrime method to see if the number should be part of the selection. That … Continue reading
Posted in algorithms, LINQ, mathematics
Tagged algorithms, C#, C# programming, example, example program, find prime numbers, lambda expression, LINQ, mathematics, prime numbers, Windows Forms programming
1 Comment
Use LINQ to find prime numbers in C# (Part 1 of 3)
This example uses LINQ to find prime numbers between 1 and a maximum value that you enter. It defines the following IsPrime method to determine whether a number is prime. // Return true if the number is prime. private bool … Continue reading
Posted in algorithms, LINQ, mathematics
Tagged algorithms, C#, C# programming, example, example program, find prime numbers, LINQ, mathematics, prime numbers, Windows Forms programming
1 Comment
Find random prime numbers in C#
The example Probabilistically determine whether a number is prime in C# explains an algorithm for determining whether a number is prime with any desired level of certainty. After you add that method to your algorithmic toolkit, finding large prime numbers … Continue reading
Determine whether a number is prime in C#
This is a cool little algorithm that uses some clever mathematics. This algorithm and several related algorithms are described in my book Essential Algorithms: A Practical Approach to Computer Algorithms. I think it’s a really good book (and it’s gotten … Continue reading
Use yield to generate prime numbers in C#
This example is based on a lesson about interfaces that I recently recorded for O’Reilly Video Training. This example shows how to use the yield return statement to generate prime numbers. More importantly it explains how yield return … Continue reading
Draw a colored fractal curve generated by prime numbers in C#
This example shows how to draw a colored fractal curve generated by prime numbers. See the example Draw a fractal curve generated by prime numbers in C# for the basic algorithm. This example assigns colors to line segments based on … Continue reading
Posted in algorithms, fractals, graphics, mathematics
Tagged algorithms, C#, C# programming, color, colored fractal, example, example program, fractal curve, fractals, graphics, mathematics, prime numbers, primes, Windows Forms programming
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Draw a fractal curve generated by prime numbers in C#
This example shows how to draw a fractal curve generated by prime numbers. It’s a modification of the earlier example Draw a fractal generated by prime numbers in C#. The basic idea is follow these rules: Start at the point … Continue reading
Posted in algorithms, fractals, graphics, mathematics
Tagged algorithms, C#, C# programming, example, example program, fractal curve, fractals, graphics, mathematics, prime numbers, primes, Windows Forms programming
1 Comment