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A324219
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Number of digits in 3^^n.
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0
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OFFSET
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-1,4
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COMMENTS
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Next term is too large to fit in the data section.
3^^n is Don Knuth's up arrow notation for the power tower 3^3^...^3 (with n threes).
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LINKS
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EXAMPLE
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3^^-1=0, so a(-1)=1;
3^^0=1, so a(0)=1;
3^^1=3, so a(1)=1;
3^^2=27, so a(2)=2;
3^^3=7625597484987, so a(3)=13;
3^^4 = 3^(3^(3^3)) = ...
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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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