diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..7c2feb7
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "editor.formatOnSave": false
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea8c0ae..ee1c38d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Next
+- Fix incorrect parsing of named numbers `Duodecillion` and greater
+
 ## 1.3.1 - 2021 Jan 14
 - Fix spelling of `Celsius` (@joseluis)
 
diff --git a/src/lookup.rs b/src/lookup.rs
index 9cb017e..75f164b 100644
--- a/src/lookup.rs
+++ b/src/lookup.rs
@@ -18,17 +18,17 @@ pub fn lookup_named_number(named_number: &NamedNumber) -> d128 {
     Nonillion         => d128!(1000000000000000000000000000000),
     Decillion         => d128!(1000000000000000000000000000000000),
     Undecillion       => d128!(1000000000000000000000000000000000000),
-    Duodecillion      => d128!(10E+39),
-    Tredecillion      => d128!(10E+42),
-    Quattuordecillion => d128!(10E+45),
-    Quindecillion     => d128!(10E+48),
-    Sexdecillion      => d128!(10E+51),
-    Septendecillion   => d128!(10E+54),
-    Octodecillion     => d128!(10E+57),
-    Novemdecillion    => d128!(10E+60),
-    Vigintillion      => d128!(10E+63),
-    Centillion        => d128!(10E+303),
-    Googol            => d128!(10E+100),
+    Duodecillion      => d128!(1E+39),
+    Tredecillion      => d128!(1E+42),
+    Quattuordecillion => d128!(1E+45),
+    Quindecillion     => d128!(1E+48),
+    Sexdecillion      => d128!(1E+51),
+    Septendecillion   => d128!(1E+54),
+    Octodecillion     => d128!(1E+57),
+    Novemdecillion    => d128!(1E+60),
+    Vigintillion      => d128!(1E+63),
+    Googol            => d128!(1E+100),
+    Centillion        => d128!(1E+303),
   }
 }