??

.envrc

@@ -0,0 +1 @@
+use_nix

.gitignore

@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk

Cargo.lock

@@ -0,0 +1,33 @@
+[[package]]
+name = "num-bigint"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "per"
+version = "0.1.0"
+dependencies = [
+ "num-bigint 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum num-bigint 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "57450397855d951f1a41305e54851b1a7b8f5d2e349543a02a2effe25459f718"
+"checksum num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "e83d528d2677f0518c570baf2b7abdcf0cd2d248860b68507bdcb3e91d4c0cea"
+"checksum num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0b3a5d7cc97d6d30d8b9bc8fa19bf45349ffe46241e8816f50f62f6d6aaabee1"

Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "per"
+version = "0.1.0"
+authors = ["Daniel Løvbrøtte Olsen <daniel@dodsorf.as>"]
+edition = "2018"
+
+[dependencies]
+num-bigint = "0.2"

shell.nix

@@ -0,0 +1,20 @@
+let
+  moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+  nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+  rustNightlyChannel = (nixpkgs.rustChannelOf { date = "2019-01-26"; channel = "nightly"; }).rust;
+	rustStableChannel = nixpkgs.latest.rustChannels.stable.rust.override {
+		extensions = [
+			"rust-src"
+			"rls-preview"
+			"clippy-preview"
+			"rustfmt-preview"
+		];
+  };
+in
+with nixpkgs;
+  stdenv.mkDerivation {
+    name = "moz_overlay_shell";
+    buildInputs = [
+      rustStableChannel
+    ];
+  }

src/main.rs

@@ -0,0 +1,30 @@
+extern crate num_bigint;
+// extern crate num_traits;
+
+use num_bigint::BigUint;
+
+
+fn main()
+{
+    let mut num = BigUint::from(0 as u8);
+    num = num + 277777788888899u128;
+
+    println!("{:?}", test(num));
+}
+
+fn test(input: BigUint) -> u8 {
+    let mut n = factorize(input);
+    let mut counter = 1;
+    while (n.to_str_radix(10).chars().count() > 0) {
+        n = factorize(n);
+        println!("n: {:?}", n);
+        counter += 1;
+    }
+    return counter;
+}
+
+fn factorize(input: BigUint) -> BigUint {
+    let string = input.to_str_radix(10);
+    let numbers: Vec<u8> = string.chars().map(|x| x as u8 - 48).collect();
+    numbers.into_iter().product::<BigUint>()
+}