On the base-dependence of sets of numbers recognizable by finite automata

  title={On the base-dependence of sets of numbers recognizable by finite automata},
  author={Alan Cobham},
  journal={Mathematical systems theory},
It is known that the set of powers of two is recognizable by a finite automaton if the notational base used for representing numbers is itself a power of two but is unrecognizable in all other bases. On the other hand, the set of multiples of two is recognizable no matter what the notational base. It is shown that the latter situation is the exception, the former the rule: the only sets recognizable independently of base are those which are ultimately periodic; others, if recognizable at all… CONTINUE READING
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Finite Automata and Their Decision Problems

IBM Journal of Research and Development • 1959
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