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A080600
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a(n) = ceiling(n*(3 + sqrt(13))/2).
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0
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0, 4, 7, 10, 14, 17, 20, 24, 27, 30, 34, 37, 40, 43, 47, 50, 53, 57, 60, 63, 67, 70, 73, 76, 80, 83, 86, 90, 93, 96, 100, 103, 106, 109, 113, 116, 119, 123, 126, 129, 133, 136, 139, 143, 146, 149, 152, 156, 159, 162, 166, 169, 172, 176, 179, 182, 185, 189
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OFFSET
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0,2
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COMMENTS
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a(0)=0, a(1)=4; for n > 1, a(n) = a(n-1) + 4 if n is already in the sequence, a(n) = a(n-1) + 3 otherwise.
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LINKS
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MATHEMATICA
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With[{c=(3+Sqrt[13])/2}, Table[Ceiling[c*n], {n, 0, 60}]] (* Harvey P. Dale, Oct 30 2021 *)
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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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