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24 101 251 Primes
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//Find the 24th, 101st and 251st prime number. using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public class Program { public static void Main(string[] args) { int primeNumber = 1; int primeCounter = 0; int prime24 = 24; int prime101 = 101; int prime251 = 251; while (true) { if ( primeNumber % 2 != 0 && primeNumber % 3 != 0 && primeNumber % 5 != 0 && primeNumber % 7 != 0 && primeNumber / primeNumber == 1) { //Console.WriteLine(primeNumber); primeCounter++; } if (primeCounter == 24 && prime24 == 24 ) { prime24 = primeNumber; Console.WriteLine("The 24th Prime number is: " + prime24); } else if (primeCounter == 101 && prime101 == 101) { prime101 = primeNumber; Console.WriteLine("The 101th Prime number is: " + prime101); } else if (primeCounter == 251 && prime251 == 251) { prime251 = primeNumber; Console.WriteLine("The 251th Prime number is: " + prime251); } primeNumber++; if (primeNumber == 10000) break; } } } }
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Compilation time: 0.12 sec, absolute running time: 0.09 sec, cpu time: 0.08 sec, average memory usage: 16 Mb, average nr of threads: 4
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The 24th Prime number is: 103 The 101th Prime number is: 439 The 251th Prime number is: 1093