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A290748
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Let F denote the two-way infinite sequence of Fibonacci numbers (for all positive or negative integers k, F(k+2)=F(k)+F(k+1) with F(0)=0, F(1)=1). Sequence lists positive numbers that are the difference between two terms of F.
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2
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 21, 22, 23, 24, 26, 29, 31, 32, 33, 34, 35, 37, 42, 47, 50, 52, 53, 54, 55, 56, 57, 58, 60, 63, 68, 76, 81, 84, 86, 87, 88, 89, 90, 92, 97, 110, 123, 131, 136, 139, 141, 142, 143, 144, 145, 146
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OFFSET
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1,2
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LINKS
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EXAMPLE
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9 is here because F(6) - F(-2) = 8 - (-1) = 9.
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MAPLE
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N:= 40: # to get all terms <= F(N) - F(N-1)
P:= sort(convert({seq(combinat:-fibonacci(n), n=-N..N)}, list)):
sort(convert(select(`<=`, {seq(seq(P[i]-P[j], j=1..i-1), i=1..nops(P))}, P[-1]-P[-2]), list)): # Robert Israel, Aug 11 2017
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MATHEMATICA
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Select[Union[Subtract @@@ Tuples[Fibonacci[Range[-30, 30]], 2]], 0 < # < 150 &] (* Giovanni Resta, Aug 11 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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