

A283890


Relative of Hofstadter Qsequence: a(n) = max(0, n+10001) for n <= 0; a(n) = a(na(n1)) + a(na(n2)) + a(na(n3)) + a(na(n4)) for n > 0.


4



10, 10002, 10003, 10004, 10005, 14, 10006, 10007, 10008, 10009, 18, 10010, 10011, 10012, 10013, 22, 10014, 10015, 10016, 10017, 26, 10018, 10019, 10020, 10021, 30, 10022, 10023, 10024, 10025, 34, 10026, 10027, 10028, 37, 10030, 10030, 39
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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 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

A283890:=proc(n) option remember: if n <= 0 then max(0, n+10001): else A283890(nA283890(n1)) + A283890(nA283890(n2)) + A283890(nA283890(n3)) + A283890(nA283890(n4)): fi: end:


CROSSREFS

Cf. A005185, A283889, A283891, A283892.
Sequence in context: A076782 A213653 A283889 * A139109 A317959 A119037
Adjacent sequences: A283887 A283888 A283889 * A283891 A283892 A283893


KEYWORD

nonn,look


AUTHOR

Nathan Fox, Mar 19 2017


STATUS

approved



