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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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6
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| R. K. Guy, Conway's RATS and other reversals, Amer. Math. Monthly, 96 (1989), 425-428.
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FORMULA
| 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
| 668 -> 668 + 866 = 1534 -> 1345.
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CROSSREFS
| Cf. A004000, A036839, A066710.
Sequence in context: A186951 A176201 A186443 * A033651 A050250 A080453
Adjacent sequences: A066708 A066709 A066710 * A066712 A066713 A066714
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 19 2002
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