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Revision History for A335493
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The successive absolute differences between two digits are the successive differences between two terms. See in the Comments section why a(n) = a(n-1) sometimes.
(history; published version)
(history; published version)
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EXAMPLE
We have seen in the Comments section why we have sometimes have to add 0 to a(n), which leads to a(n+1) = a(n).
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COMMENTS
To extend the sequence S with a new tern term a(n), we always add to a(n-1) the last absolute difference D between two digits that must be considered. As a term of S can have two successive identical digits [like a(19) = 55 here], or, in general, as two successive digits of S can be identical, we will see sometimes in S two or more equal terms following each other [like a(27) = a(28) = a(29) = 73 here].
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approved
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editing
proposed