Given the dictionary {0,1,+,*,<} can I write a simple formula with only x occurs free, that states "x is an exponent of 6"?

When I say simple, I mean, without using complicated techniques like Betta function. Thanks

  • $\begingroup$ Not recursive formula either, I assume? $\endgroup$ – Bram28 May 7 at 20:48
  • $\begingroup$ How can you write it in the language? $\endgroup$ – Chris wells May 18 at 0:56

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