Pick a number between 1 and 99, write it as a word, then count the letters to get a new number. Write the new number as a word, and count its letters- repeat. This curiosity was tweeted by@IanMathmogician, and if you try it you’ll find you get stuck at the number 4- the only number equal to its letter-count. This image shows the network of what your possible routes to 4 could be. It shows you’ll always get there after 5 steps.
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