Can enter multi-digit numeric prefixes in command mode.

src/atom/vim-mode-operators.coffee

@@ -14,6 +14,9 @@ module.exports =
 
     isComplete: -> @complete
 
+    addDigit: (digit) ->
+      @count = @count * 10 + digit
+
     execute: (editor) ->
       _.times @count, => @operatorToRepeat.execute(editor)
 

src/atom/vim-mode.coffee

@@ -48,7 +48,7 @@ class VimMode
       eventName = "command-mode:#{commandName}"
       @editor.on eventName, (e) =>
         possibleOperator = fn(e)
-        @pushOperator(possibleOperator) if possibleOperator.execute?
+        @pushOperator(possibleOperator) if possibleOperator?.execute
 
   activateInsertMode: ->
     @editor.removeClass('command-mode')
@@ -60,7 +60,10 @@ class VimMode
 
   numericPrefix: (e) ->
     num = parseInt(e.keyEvent.keystroke)
-    new op.NumericPrefix(num)
+    if @topOperator() instanceof op.NumericPrefix
+      @topOperator().addDigit(num)
+    else
+      @pushOperator(new op.NumericPrefix(num))
 
   pushOperator: (op) ->
     @opStack.push(op)