init

problems/p27/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "p27"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+primal = "0.3"

problems/p27/src/main.rs

@@ -0,0 +1,37 @@
+use primal::is_prime;
+
+fn gen_prime_count(a: i32, b: i32) -> i32 {
+    let mut count = 0i32;
+
+    let mut result = count * count + a * count + b;
+    if result <= 0 {
+        return count;
+    }
+
+    while is_prime(result as u64) {
+        count += 1;
+        result = count * count + a * count + b;
+    }
+
+    count
+}
+#[test]
+fn test_gen_prime_count() {
+    assert_eq!(gen_prime_count(1, 41), 40);
+    assert_eq!(gen_prime_count(-79, 1601), 80);
+}
+
+fn main() {
+    let mut max_len = 0;
+    let mut max_product = 0;
+    for a in -1000..1000 {
+        for b in -1000..1000 {
+            let len = gen_prime_count(a, b);
+            if len > max_len {
+                max_len = len;
+                max_product = a * b;
+            }
+        }
+    }
+    println!("{max_product}");
+}