Just to add a resource for testing it out, the wikilooper does it automatically for you.
But - I think better to enter the word in the url bar as http://www.wikiloopr.com/test instead of using the form on the page itself - when I enter a word in the form, then I sometimes get two loops going on at once, with the words getting mixed up some from one loop, one from the other.
It's a bit slow but automatic so you can go away and come back and see what it's found.
Then, found a nice graph here, though it is out of date now of course, still gives a rough idea of what it's like: