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A080783
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a(1)=1, a(n)=a(n-1)-1 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.
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2
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1, 6, 11, 16, 21, 20, 25, 30, 35, 40, 39, 44, 49, 54, 59, 58, 63, 68, 73, 72, 71, 76, 81, 86, 85, 90, 95, 100, 105, 104, 109, 114, 119, 124, 123, 128, 133, 138, 137, 136, 141, 146, 151, 150, 155, 160, 165, 170, 169, 174, 179, 184, 189, 188, 193, 198
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OFFSET
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1,2
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LINKS
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FORMULA
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Conjectured to be asymptotic to 3n as n -> infinity.
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MATHEMATICA
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lst={1}; i=2; Do[If[MemberQ[lst, i], AppendTo[lst, Last[lst]-1], AppendTo[ lst, Last[lst]+5]]; i++, {60}]; lst (* Harvey P. Dale, Aug 20 2011 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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