solutions: 63

src/bin/powerful_digit_counts.rs

@@ -0,0 +1,15 @@
+use num_bigint::BigUint;
+
+fn main() {
+    let mut count = 0;
+    for i in 1..=9 {
+        for j in 1..=100 {
+            let length = BigUint::from(i as u64).pow(j).to_string().len();
+            if length == j.try_into().unwrap() {
+                count += 1;
+            }
+        }
+    }
+
+    println!("{}", count);
+}