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A080904
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a(1)=1; for n>1, a(n)=a(n-1)-4 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, 17, 22, 27, 32, 37, 33, 38, 43, 48, 53, 49, 45, 50, 55, 60, 56, 52, 57, 62, 67, 72, 68, 73, 78, 83, 88, 84, 80, 85, 90, 95, 91, 87, 92, 97, 102, 107, 103, 108, 104, 109, 114, 110, 106, 102, 107, 103, 99, 104, 100, 96, 92, 97, 102, 98, 103, 99
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OFFSET
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1,2
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COMMENTS
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a(n)-n is eventually periodic with period 18. - Ivan Neretin, Mar 03 2016
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LINKS
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MATHEMATICA
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Fold[Append[#1, #1[[-1]] + If[MemberQ[#1, #2], -4, 5]] &, {1}, Range[2, 62]] (* Ivan Neretin, Mar 03 2016 *)
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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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