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A292856 Numbers n such that 7 applications of 'Reverse and Subtract' lead to n, whereas fewer than 7 applications do not lead to n. 10
142710354353443018141857289645646556981858, 236547461211163745741763452538788836254258, 331948602685207939133668051397314792060866, 336111694728585211732663888305271414788267 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
There are 7 forty-two-digit terms in the sequence. Terms of derived sequences can be obtained either by inserting at the center of their digits any number of 9's or by concatenating a term any number of times with itself and inserting an equal number of 0's at all junctures.
LINKS
J. H. E. Cohn, Palindromic differences, Fibonacci Quart. 28 (1990), no. 2, 113-120.
FORMULA
n = f^7(n), n <> f^k(n) for k < 7, where f: x -> |x - reverse(x)|.
EXAMPLE
142710354353443018141857289645646556981858 -> 715479301293103964616284520698706896035383 -> 331948602685207939133668051397314792060866 -> 336111694728585211732663888305271414788267 -> 426775719443918676633573224280556081323366 -> 236547461211163745741763452538788836254258 -> 615905177676671508625384094822323328491374 -> 142710354353443018141857289645646556981858
CROSSREFS
Sequence in context: A003937 A120335 A095476 * A292846 A181789 A095478
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Terms ordered by Ray Chandler, Sep 27 2017
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)