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Vigesimal
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== Cyclic numbers == The prime factorization of twenty is 2<sup>2</sup> Γ 5, so it is not a [[perfect power]]. However, its squarefree part, 5, is congruent to 1 (mod 4). Thus, according to [[Artin's conjecture on primitive roots]], vigesimal has infinitely many [[cyclic number|cyclic]] primes, but the fraction of primes that are cyclic is not necessarily ~37.395%. An UnrealScript program that computes the lengths of recurring periods of various fractions in a given set of bases found that, of the first 15,456 primes, ~39.344% are cyclic in vigesimal.
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