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A175425
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The smallest number m which needs n iterations of the map x->A175420(x) to reach a single-digit number.
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8
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OFFSET
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0,2
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COMMENTS
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Conjecture: sequence a(n) is finite for n = natural number, a(n) = 25 for n = infinity. See A175424.
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LINKS
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FORMULA
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EXAMPLE
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a(4) = 33 because 33 is the smallest numbers with 4 steps of defined iteration: 3^3 = 27, 7^2 = 49, 9^4 = 6561, ((1^6)^5)^6 = 1.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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