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A080707
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a(1)=5; for n>1, a(n) = smallest number > a(n-1) such that the condition "n is in the sequence if and only if a(n) is a multiple of 3" is satisfied.
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0
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5, 7, 8, 10, 12, 13, 15, 18, 19, 21, 22, 24, 27, 28, 30, 31, 32, 33, 36, 37, 39, 42, 43, 45, 46, 47, 48, 51, 52, 54, 57, 60, 63, 64, 65, 66, 69, 70, 72, 73, 74, 75, 78, 79, 81, 84, 87, 90, 91, 92, 93, 96, 97, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 111, 114, 117
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OFFSET
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1,1
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LINKS
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FORMULA
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{a(a(n))} = {3i : i >= 4}.
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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Benoit Cloitre, Mar 01 2003
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EXTENSIONS
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STATUS
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approved
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