A283888 - OEIS

A283888

Relative of Hofstadter Q-sequence: a(n) = max(0, n+27298) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.

6, 27299, 27300, 27301, 9, 27302, 27303, 27304, 12, 27305, 27306, 27307, 15, 27308, 27309, 17, 27311, 18, 27311, 27313, 27314, 22, 21, 54607, 54601, 9, 18, 54616, 54619, 27307, 22, 27328, 27333, 27311, 27, 36, 27335, 54606, 27302, 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 27298 terms.

Most terms in this sequence appear in a long pattern stretching from a(85652) through a(141867984), of 16 interleaved sequences.

This sequence has exactly 141868181 terms (of positive index). a(141868181) = 0, so an attempt to calculate a(141868182) would refer to itself.

LINKS

Nathan Fox, Table of n, a(n) for n = 1..90000

FORMULA

If the index is between 67 and 27299 (inclusive), then a(7n) = 7n+2, a(7n+1) = 7n+27300, a(7n+2) = 7n+27302, a(7n+3) = 7, a(7n+4) = 2n+54641, a(7n+5) = n+54589, a(7n+6) = 27296.

MAPLE

A283888:=proc(n) option remember: if n <= 0 then max(0, n+27298): else A283888(n-A283888(n-1)) + A283888(n-A283888(n-2)) + A283888(n-A283888(n-3)): fi: end:

CROSSREFS

Cf. A005185, A267501, A274058, A278055, A278066, A283884, A283885, A283886, A283887.

Sequence in context: A225716 A159429 A367944 * A134728 A127488 A294322

Adjacent sequences: A283885 A283886 A283887 * A283889 A283890 A283891

KEYWORD

nonn,fini

AUTHOR

Nathan Fox, Mar 19 2017

STATUS

approved