As far as I know, Nikola Tesla was more astounded (that should've been the word you used) with the numbers 3,6, and 9 and their occurrences in nature. For example, in 1 circle there is 360 degrees, 3+6+0=9, and 360/40=9. read more
Tesla was obsessed with the number three, and before entering a building he would often feel the urge to walk around the block three times. He would disconcert guests by estimating the mass of his meal before taking a bite and counting jaw movements while he was eating. read more
Wizard: The Life and Times of Nikola Tesla and I don't recall an obsession with the number three being mentioned in any of them. All I can suppose is that if it was mentioned it didn't figure prominently compared to his other obsessions. read more