Yellowstone sequence: Difference between revisions

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For A <= 3,
For A <= 3,

====a(n) = n====
a(n) = n.

For n >= 4,
For n >= 4,

====a(n) = the smallest number not already in sequence such that a(n) is relatively prime to a(n-1) and is not relatively prime to a(n-2).====
a(n) = the smallest number not already in sequence such that a(n) is relatively prime to a(n-1) and is not relatively prime to a(n-2).


The sequence is a permutation of the natural numbers, and gets its name from what its authors felt was a spiking, fountain like appearance of a plot of the sequence.
The sequence is a permutation of the natural numbers, and gets its name from what its authors felt was a spiking, fountain like appearance of a plot of the sequence.
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