diff --git a/c_impl/src/main.c b/c_impl/src/main.c
index 3cc4e66..ed698ce 100644
--- a/c_impl/src/main.c
+++ b/c_impl/src/main.c
@@ -39,7 +39,7 @@ int main(int argc, char **argv) {
         sum += 1.0 / (double)(PGenerator_Next(&state));
     }
 
-    printf("Resulting sum == %lf, last state is %llu\n", sum, state.current);
+    printf("Resulting sum == %.16lf, last state is %llu\n", sum, state.current);
 
     return 0;
 }
diff --git a/rust_impl/Cargo.lock b/rust_impl/Cargo.lock
new file mode 100644
index 0000000..8b257ae
--- /dev/null
+++ b/rust_impl/Cargo.lock
@@ -0,0 +1,225 @@
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diff --git a/rust_impl/Cargo.toml b/rust_impl/Cargo.toml
index 44b4995..a19ff85 100644
--- a/rust_impl/Cargo.toml
+++ b/rust_impl/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+structopt = "0.3"
diff --git a/rust_impl/src/main.rs b/rust_impl/src/main.rs
index e7a11a9..8d094ea 100644
--- a/rust_impl/src/main.rs
+++ b/rust_impl/src/main.rs
@@ -1,3 +1,101 @@
-fn main() {
-    println!("Hello, world!");
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug, Clone)]
+struct Args {
+    #[structopt(short, long, default_value = "128")]
+    limit: u64,
+}
+
+#[derive(Debug, Clone)]
+pub struct PGeneratorState {
+    current: u64,
+}
+
+impl Default for PGeneratorState {
+    fn default() -> Self {
+        Self {
+            current: 0,
+        }
+    }
+}
+
+impl PGeneratorState {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    fn is_palindrome(n: u64) -> bool {
+        // get digit count of n
+        let mut digits: u64 = 0;
+        let mut temp: u64 = n;
+        while temp > 0 {
+            digits += 1;
+            temp /= 10;
+        }
+
+        if digits == 0 {
+            panic!("Invalid state, digits == 0");
+        }
+
+        // get "end" and "start" digits
+        let mut end: u64 = 0;
+        let mut start: u64 = digits - 1;
+        let mut temp2: u64;
+        let mut temp3: u64;
+
+        while end < start {
+            // get "end" digit
+            temp = n;
+            temp2 = 0;
+            while temp2 < end {
+                temp /= 10;
+                temp2 += 1;
+            }
+            temp %= 10;
+
+            // get "start" digit
+            temp2 = n;
+            temp3 = 0;
+            while temp3 < start {
+                temp2 /= 10;
+                temp3 += 1;
+            }
+            temp2 %= 10;
+
+            if temp != temp2 {
+                // mismatch, is not a palindrome
+                return false;
+            }
+
+            // cannot yet prove is palindrome until convergence
+            end += 1;
+            start -= 1;
+        }
+
+        // no mismatches, is palindrome
+        true
+    }
+
+    pub fn next(&mut self) -> u64 {
+        loop {
+            self.current += 1;
+            if Self::is_palindrome(self.current) {
+                return self.current;
+            }
+        }
+    }
+}
+
+fn main() {
+    let mut args = Args::from_args();
+    println!("Using limit of \"{}\"", args.limit);
+
+    let mut sum: f64 = 0.0;
+    let mut pgen = PGeneratorState::new();
+    while args.limit > 0 {
+        args.limit -= 1;
+        sum += 1.0 / (pgen.next() as f64);
+    }
+
+    println!("Sum is {}, last palindrome is {}", sum, pgen.current);
 }