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Search: id:A123274
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| A123274 |
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a(0)=a(1)=a(2) = 1. a(n) = (a(n-1) +a(n-2)) /GCD(a(n-1)+a(n-2),a(n-3)), for n >= 3. |
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+0
1
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| 1, 1, 1, 2, 3, 5, 4, 3, 7, 5, 4, 9, 13, 11, 8, 19, 27, 23, 50, 73, 123, 98, 221, 319, 270, 589, 859, 724, 1583, 2307, 1945, 4252, 6197, 10449, 8323, 18772, 27095, 45867, 36481, 82348, 118829, 201177, 160003, 361180, 521183, 882363, 701773, 1584136, 2285909
(list; graph; listen)
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OFFSET
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0,4
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MATHEMATICA
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f[l_List] := Append[l, (l[[ -1]] + l[[ -2]])/GCD[l[[ -1]] + l[[ -2]], l[[ -3]]]]; Nest[f, {1, 1, 1}, 46] (*Chandler*)
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CROSSREFS
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Adjacent sequences: A123271 A123272 A123273 this_sequence A123275 A123276 A123277
Sequence in context: A058981 A117339 A096016 this_sequence A023818 A102149 A104204
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Oct 10 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 17 2006
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