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Search: id:A066711
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| A066711 |
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RATS: Reverse Add Then Sort the digits applied to previous term, starting with 9. |
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+0
7
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| 9, 18, 99, 189, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117, 288, 117
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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R. K. Guy, Conway's RATS and other reversals, Amer. Math. Monthly, 96 (1989), 425-428.
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FORMULA
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Let a(n) = k, form m by Reversing the digits of k, Add m to k Then Sort the digits of the sum into increasing order to get a(n+1).
Periodic with period 2.
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EXAMPLE
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668 -> 668 + 866 = 1534 -> 1345.
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CROSSREFS
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Cf. A004000, A036839, A066710.
Sequence in context: A107313 A166640 A140149 this_sequence A033651 A050250 A080453
Adjacent sequences: A066708 A066709 A066710 this_sequence A066712 A066713 A066714
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 19 2002
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