diff --git a/src/euler24/Cargo.toml b/src/euler24/Cargo.toml
new file mode 100644
index 0000000..59af77f
--- /dev/null
+++ b/src/euler24/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "euler24"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+itertools = "*"
diff --git a/src/euler24/src/main.rs b/src/euler24/src/main.rs
new file mode 100644
index 0000000..01696b4
--- /dev/null
+++ b/src/euler24/src/main.rs
@@ -0,0 +1,8 @@
+use itertools::Itertools;
+
+fn main() {
+    let digits = vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+    let mut data: Vec<_> = digits.into_iter().permutations(10).collect();
+    data.sort_unstable();
+    println!("{:?}", data[999_999]);
+}
diff --git a/src/euler25/Cargo.toml b/src/euler25/Cargo.toml
new file mode 100644
index 0000000..5384e78
--- /dev/null
+++ b/src/euler25/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "euler25"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+num-bigint = "*"
+num-traits = "*"
diff --git a/src/euler25/src/main.rs b/src/euler25/src/main.rs
new file mode 100644
index 0000000..45127e9
--- /dev/null
+++ b/src/euler25/src/main.rs
@@ -0,0 +1,21 @@
+use num_bigint::BigUint;
+use num_traits::One;
+
+const MAX_IDX: usize = 4782;
+
+fn main() {
+    let number = fib(MAX_IDX - 1);
+    let s = number.to_str_radix(10);
+    println!("{}: {}: {}", MAX_IDX, fib(MAX_IDX - 1), s.len());
+}
+
+fn fib(n: usize) -> BigUint {
+    let mut f0 = BigUint::one();
+    let mut f1 = BigUint::one();
+    for _ in 0..n {
+        let f2 = f0 + &f1;
+        f0 = f1;
+        f1 = f2;
+    }
+    f0
+}