diff --git a/extra/project-euler/051/051-tests.factor b/extra/project-euler/051/051-tests.factor
new file mode 100644
index 0000000000..f6bd5bc37a
--- /dev/null
+++ b/extra/project-euler/051/051-tests.factor
@@ -0,0 +1,4 @@
+USING: project-euler.051 tools.test ;
+IN: project-euler.051.tests
+
+[ 121313 ] [ euler051 ] unit-test
diff --git a/extra/project-euler/051/authors.txt b/extra/project-euler/051/authors.txt
new file mode 100644
index 0000000000..790786959d
--- /dev/null
+++ b/extra/project-euler/051/authors.txt
@@ -0,0 +1 @@
+Jon Harper
\ No newline at end of file
diff --git a/extra/project-euler/project-euler.factor b/extra/project-euler/project-euler.factor
index 1bba3182d1..3438de8c2d 100644
--- a/extra/project-euler/project-euler.factor
+++ b/extra/project-euler/project-euler.factor
@@ -14,17 +14,17 @@ USING: definitions io io.files io.pathnames kernel math math.parser
     project-euler.037 project-euler.038 project-euler.039 project-euler.040
     project-euler.041 project-euler.042 project-euler.043 project-euler.044
     project-euler.045 project-euler.046 project-euler.047 project-euler.048
-    project-euler.049 project-euler.052 project-euler.053 project-euler.054
-    project-euler.055 project-euler.056 project-euler.057 project-euler.058
-    project-euler.059 project-euler.063 project-euler.067 project-euler.069
-    project-euler.071 project-euler.072 project-euler.073 project-euler.074
-    project-euler.075 project-euler.076 project-euler.079 project-euler.085
-    project-euler.092 project-euler.097 project-euler.099 project-euler.100
-    project-euler.102 project-euler.112 project-euler.116 project-euler.117
-    project-euler.124 project-euler.134 project-euler.148 project-euler.150
-    project-euler.151 project-euler.164 project-euler.169 project-euler.173
-    project-euler.175 project-euler.186 project-euler.190 project-euler.203
-    project-euler.215 ;
+    project-euler.049 project-euler.051 project-euler.052 project-euler.053 
+    project-euler.054 project-euler.055 project-euler.056 project-euler.057 
+    project-euler.058 project-euler.059 project-euler.063 project-euler.067 
+    project-euler.069 project-euler.071 project-euler.072 project-euler.073 
+    project-euler.074 project-euler.075 project-euler.076 project-euler.079
+    project-euler.085 project-euler.092 project-euler.097 project-euler.099 
+    project-euler.100 project-euler.102 project-euler.112 project-euler.116 
+    project-euler.117 project-euler.124 project-euler.134 project-euler.148
+    project-euler.150 project-euler.151 project-euler.164 project-euler.169 
+    project-euler.173 project-euler.175 project-euler.186 project-euler.190
+    project-euler.203 project-euler.215 ;
 IN: project-euler
 
 <PRIVATE