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 A283889 Relative of Hofstadter Q-sequence: a(n) = max(0, n+10000) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) + a(n-a(n-4)) for n > 0. 4
 10, 10001, 10002, 10003, 10004, 14, 10005, 10006, 10007, 10008, 18, 10009, 10010, 10011, 10012, 22, 10013, 10014, 10015, 10016, 26, 10017, 10018, 10019, 10020, 30, 10021, 10022, 10023, 10024, 34, 10025, 10026, 10027, 37, 10029, 10029, 39 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequences like this are more naturally considered with the first nonzero term in position 1. But this sequence would then match A000027 for its first 10000 terms. This sequence has some stretches where it is quasilinear, but it appears to be ultimately chaotic. LINKS Nathan Fox, Table of n, a(n) for n = 1..50000 MAPLE A283889:=proc(n) option remember: if n <= 0 then max(0, n+10000): else A283889(n-A283889(n-1)) + A283889(n-A283889(n-2)) + A283889(n-A283889(n-3)) + A283889(n-A283889(n-4)): fi: end: CROSSREFS Cf. A005185, A283890, A283891, A283892. Sequence in context: A013746 A076782 A213653 * A283890 A139109 A317959 Adjacent sequences:  A283886 A283887 A283888 * A283890 A283891 A283892 KEYWORD nonn,look AUTHOR Nathan Fox, Mar 19 2017 STATUS approved

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Last modified February 24 00:51 EST 2020. Contains 332195 sequences. (Running on oeis4.)