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There are actually more than a pattern rule for that type of sequence.

The pattern rule is not obvious. The sequence is actually this:

an = 5a(n - 2) for n > 2, such that the seed values are a1 = 1 and a2 = 5.

Another pattern rule is the number of palindromes using a maximum of five different symbols.

The third one is the Inverse Binomial Mean transformation of the Fibonacci sequence.

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11y ago
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Q: What is the pattern rule of 5 5 25 25 125?
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