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 A209878 RATS: Reverse Add Then Sort the digits applied to previous term, starting with 20169. 7
 20169, 111267, 337788, 1122255, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666, 1111113, 2222244, 4446666 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A114613(1) = 20169 is the smallest starting number for a RATS trajectory leading to a cycle of length 3: A114611(20169) = 3; a(n + 3) = a(n) for n > 4. LINKS Eric Weisstein's World of Mathematics, RATS Sequence Index entries for linear recurrences with constant coefficients, signature (0, 0, 1). FORMULA a(n + 1) = A036839(a(n)). MATHEMATICA Join[{20169, 111267, 337788, 1122255}, LinearRecurrence[{0, 0, 1}, {4446666, 1111113, 2222244}, 25]] (* Ray Chandler, Aug 25 2015 *) PROG (Haskell) a209878 n = a209878_list !! (n-1) a209878_list = iterate a036839 20169 CROSSREFS Cf. A004000, A066710, A066711, A209879, A209880. Sequence in context: A235520 A235651 A114613 * A031682 A052358 A052189 Adjacent sequences:  A209875 A209876 A209877 * A209879 A209880 A209881 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Mar 14 2012 STATUS approved

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Last modified July 16 04:26 EDT 2019. Contains 325064 sequences. (Running on oeis4.)