import jupyter.Displayer;
import jupyter.Displayers;
Displayers.register(Integer.class, new Displayer<Integer>() {
      @Override
      public Map<String, String> display(Integer value) {
        return new HashMap<String, String>() {{
          put(MIMEContainer.MIME.TEXT_HTML, "<div><h1>" + value + "</h1></div>");
          
        }};
      }
    });

1+1