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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Strong-and-weak-primes/C-sharp/strong-and-weak-primes.cs Normal file
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using static System.Console;
using static System.Linq.Enumerable;
using System;
public static class StrongAndWeakPrimes
{
public static void Main() {
var primes = PrimeGenerator(10_000_100).ToList();
var strongPrimes = from i in Range(1, primes.Count - 2) where primes[i] > (primes[i-1] + primes[i+1]) / 2 select primes[i];
var weakPrimes = from i in Range(1, primes.Count - 2) where primes[i] < (primes[i-1] + primes[i+1]) / 2.0 select primes[i];
WriteLine($"First 36 strong primes: {string.Join(", ", strongPrimes.Take(36))}");
WriteLine($"There are {strongPrimes.TakeWhile(p => p < 1_000_000).Count():N0} strong primes below {1_000_000:N0}");
WriteLine($"There are {strongPrimes.TakeWhile(p => p < 10_000_000).Count():N0} strong primes below {10_000_000:N0}");
WriteLine($"First 37 weak primes: {string.Join(", ", weakPrimes.Take(37))}");
WriteLine($"There are {weakPrimes.TakeWhile(p => p < 1_000_000).Count():N0} weak primes below {1_000_000:N0}");
WriteLine($"There are {weakPrimes.TakeWhile(p => p < 10_000_000).Count():N0} weak primes below {1_000_000:N0}");
}
}