diff --git a/20260321 b/20260321
new file mode 100644
index 0000000..bfe466f
--- /dev/null
+++ b/20260321
@@ -0,0 +1,45 @@
+#include <iostream>
+using namespace std;
+
+// 判断是否是素数
+bool isPrime(int n)
+{
+    if (n < 2) return false;
+
+    for (int i = 2; i * i <= n; i++)
+    {
+        if (n % i == 0)
+            return false;
+    }
+    return true;
+}
+
+// 判断是否是回文数
+bool isPalindrome(int n)
+{
+    int original = n;
+    int reversed = 0;
+
+    while (n > 0)
+    {
+        reversed = reversed * 10 + n % 10;
+        n /= 10;
+    }
+
+    return original == reversed;
+}
+
+int main()
+{
+    cout << "100到1000之间的回文素数有：" << endl;
+
+    for (int i = 100; i <= 1000; i++)
+    {
+        if (isPrime(i) && isPalindrome(i))
+        {
+            cout << i << " ";
+        }
+    }
+
+    return 0;
+}
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