He was walking around a block repeatedly for three times before entering a building, he would clean his plates with 18 napkins, he lived in hotel rooms only with a number devisable by 3. He would make calculations about things in his immediate environment to make sure the result is devisable by 3 and base his choices upon the results. He would do everything in sets of 3.

Some say he had OCD, some say he was very superstitious.

However, the truth is a lot deeper.

“If you knew the magnificence of the three, six and nine, you would have a key to the universe.” – Nikola Tesla

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http://www.anonews.co/tesla-secret-numbers/