For what it's worth, The Online Encyclopedia of Integer Sequences[1] confirms his claim. [1] https://oeis.org/search?q=3%2C+6%2C+9%2C+21%2C+22%2C+47%2C+78%2C+8

For what it's worth, The Online Encyclopedia of Integer Sequences[1] confirms his claim. [1] https://oeis.org/search?q=3%2C+6%2C+9%2C+21%2C+22%2C+47%2C+78%2C+89%2C+134%2C+225%2C+368&language=english&go=Search https://oeis.org/search?q=3%2C+6%2C+9%2C+21%2C+22%2C+47%2C+7...