From 1d68e2f2ad59af2b340d6b36d89d691a055736ea Mon Sep 17 00:00:00 2001
From: Jorge Navarro Enamorado
 <110049286+jorgenavarroenamoradotokio@users.noreply.github.com>
Date: Thu, 7 Sep 2023 11:56:04 +0200
Subject: [PATCH] =?UTF-8?q?Reto=20#21=20-=20N=C3=9AMEROS=20PRIMOS=20GEMELO?=
 =?UTF-8?q?S=20[Media]?=
MIME-Version: 1.0
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---
 .../java/jorgenavarroenamoradotokio.java"     | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 "Retos/Reto #21 - N\303\232MEROS PRIMOS GEMELOS [Media]/java/jorgenavarroenamoradotokio.java"

diff --git "a/Retos/Reto #21 - N\303\232MEROS PRIMOS GEMELOS [Media]/java/jorgenavarroenamoradotokio.java" "b/Retos/Reto #21 - N\303\232MEROS PRIMOS GEMELOS [Media]/java/jorgenavarroenamoradotokio.java"
new file mode 100644
index 0000000000..7e3b0b7737
--- /dev/null
+++ "b/Retos/Reto #21 - N\303\232MEROS PRIMOS GEMELOS [Media]/java/jorgenavarroenamoradotokio.java"	
@@ -0,0 +1,31 @@
+package com.retos.ej21;
+
+import java.util.stream.IntStream;
+
+public class jorgenavarroenamoradotokio {
+
+	public static void main(String[] args) {
+		int rangoMaximo = 14; // Cambia este valor al rango máximo deseado
+
+		System.out.println("Pares de números primos gemelos en el rango hasta " + rangoMaximo + ":");
+		IntStream.rangeClosed(2, rangoMaximo - 2).filter(number -> isPrime(number) && isPrime(number + 2))
+				.forEach(number -> System.out.println("(" + number + ", " + (number + 2) + ")"));
+	}
+
+	public static boolean isPrime(int number) {
+		if (number <= 1) {
+			return false;
+		}
+
+		if (number <= 3) {
+			return true;
+		}
+
+		if (number % 2 == 0 || number % 3 == 0) {
+			return false;
+		}
+
+		return IntStream.rangeClosed(5, (int) Math.sqrt(number))
+				.allMatch(i -> number % i != 0 && number % (i + 2) != 0);
+	}
+}