Is there some concise mathematical form to express the fact that a sequence repeats with period t beginning with the nth term? For example, the sequence {1,2,6,3,7,3,1,7,3,1,7,3,1,7,3,1,...} repeats with period 3 beginning with the 5th term. Can we say, for all n>4, if b=a(adsbygoogle = window.adsbygoogle || []).push({}); _{n}then b=a_{n+3}?

I need to prove that a certain sequence doesn't repeat. How is this commonly done?

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# Repeating sequences

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