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 A283892 Relative of Hofstadter Q-sequence. 4
 28, 10002, 10003, 10004, 10005, 10006, 10007, 10008, 35, 10009, 10010, 10011, 10012, 10013, 10014, 10015, 42, 10016, 10017, 10018, 10019, 10020, 10021, 10022, 49, 10023, 10024, 10025, 10026, 10027, 10028, 10029, 56, 10030, 10031, 10032, 10033, 10034, 10035, 10036, 63 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence is defined by a(n) = max(0, n+10001) 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)) + a(n-a(n-5)) + a(n-a(n-6)) + a(n-a(n-7)) for n > 0. 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 10001 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 A283892:=proc(n) option remember: if n <= 0 then max(0, n+10001): else A283892(n-A283892(n-1)) + A283892(n-A283892(n-2)) + A283892(n-A283892(n-3)) + A283892(n-A283892(n-4)) + A283892(n-A283892(n-5)) + A283892(n-A283892(n-6)) + A283892(n-A283892(n-7)): fi: end: CROSSREFS Cf. A005185, A283889, A283890, A283891. Sequence in context: A281128 A222018 A283891 * A281652 A221691 A159415 Adjacent sequences: A283889 A283890 A283891 * A283893 A283894 A283895 KEYWORD nonn AUTHOR Nathan Fox, Mar 19 2017 STATUS approved

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Last modified February 1 06:22 EST 2023. Contains 359981 sequences. (Running on oeis4.)