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A283895
Relative of Hofstadter Q-sequence: a(1) = 41, a(2) = 2; thereafter a(n) = a(n-a(n-1)) + a(n-a(n-2)).
5
41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 2, 41, 43, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2, 84, 2
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 constant. Such runs of terms are eventually separated by either 224 or 562 other terms, and each run is approximately twice as long as the previous.
MAPLE
A283895:=proc(n) option remember: if n <= 0 then 0: elif n = 1 then 41: elif n = 2 then 2: else A283895(n-A283895(n-1)) + A283895(n-A283895(n-2)): fi: end:
KEYWORD
nonn
AUTHOR
Nathan Fox, Mar 19 2017
STATUS
approved