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A126091
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a(1)=1;a(2)=4; for n>2, a(n)=a(n-2)+3 if n is already in the sequence, a(n)=a(n-2)+1 otherwise.
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0
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1, 4, 2, 7, 3, 8, 6, 11, 7, 12, 10, 15, 11, 16, 14, 19, 15, 20, 18, 23, 19, 24, 22, 27, 23, 28, 26, 31, 27, 32, 30, 35, 31, 36, 34, 39, 35, 40, 38, 43, 39, 44, 42, 47, 43, 48, 46, 51, 47, 52, 50, 55, 51, 56, 54, 59, 55, 60, 58, 63, 59, 64, 62, 67, 63, 68, 66, 71, 67, 72, 70, 75
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| a={1, 4}; Do[If[MemberQ[a, n], b=a[[n-2]]+3, b=a[[n-2]]+1]; AppendTo[a, b], {n, 3, 70}]; a
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CROSSREFS
| Cf. A080578, A080455-A080458.
Sequence in context: A021238 A161179 A105727 * A026189 A026213 A123684
Adjacent sequences: A126088 A126089 A126090 * A126092 A126093 A126094
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)gmail.com), Mar 11 2007
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