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 A283894 Relative of Hofstadter Q-sequence: a(1) = 17, a(2) = 2; thereafter a(n) = a(n-a(n-1)) + a(n-a(n-2)). 5
 17, 2, 17, 2, 17, 2, 17, 2, 17, 2, 17, 2, 17, 2, 17, 2, 17, 19, 2, 36, 2, 36, 2, 36, 2, 36, 2, 36, 2, 36, 2, 36, 2, 36, 2, 36, 19, 4, 38, 38, 34, 4, 55, 38, 17, 4, 91, 38, 17, 4, 127, 38, 17, 21, 40, 4, 34, 57, 4, 21, 72, 34, 2, 70, 2, 70, 2, 70, 2, 70, 19, 19, 42, 76, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS In calculating terms of this sequence, use the convention that a(n)=0 for n <= 0. Most terms in this sequence alternate between 2 and a large number. Such runs of terms are separated by 102 other terms, and each run is approximately twice as long as the previous. LINKS Nathan Fox, Table of n, a(n) for n = 1..10000 FORMULA For nonnegative integers i, if 1 <= 2n + r <= 594*2^(i+1) - 2, then a(594*2^i + 100 + 2n) = 2 a(594*2^i + 100 + 2n + 1) = 594*2^(i+1) - 2. MAPLE A283894:=proc(n) option remember: if n <= 0 then 0: elif n = 1 then 17: elif n = 2 then 2: else A283894(n-A283894(n-1)) + A283894(n-A283894(n-2)): fi: end: CROSSREFS Cf. A005185, A278066, A278067, A278068, A283893, A283895, A283896, A283897. Sequence in context: A051311 A040287 A252940 * A016735 A034059 A303733 Adjacent sequences: A283891 A283892 A283893 * A283895 A283896 A283897 KEYWORD nonn AUTHOR Nathan Fox, Mar 19 2017 STATUS approved

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Last modified March 28 23:03 EDT 2023. Contains 361596 sequences. (Running on oeis4.)