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A194662
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Number of k in [1,n] for which <n*r>+<k*r> > 1, where < > = fractional part and r = (1+sqrt(5))/2 (the golden ratio); row sums of A164661.
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2
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1, 0, 3, 2, 0, 4, 2, 8, 6, 2, 9, 5, 0, 9, 3, 14, 9, 2, 14, 7, 21, 14, 5, 21, 12, 2, 19, 8, 27, 17, 5, 25, 13, 0, 22, 8, 32, 18, 3, 28, 13, 40, 25, 8, 37, 20, 2, 32, 13, 45, 27, 7, 40, 20, 55, 35, 13, 50, 28, 5, 43, 20, 60, 37, 12, 53, 28, 2, 45, 18, 63, 36, 8, 54, 26, 74, 46
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..77.
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MATHEMATICA
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r = GoldenRatio; z = 14;
p[x_] := FractionalPart[x]; f[x_] := Floor[x];
h[n_, k_] := f[p[n*r] + p[k*r]]
Flatten[Table[h[n, k], {n, 1, z}, {k, 1, n}]] (* A194661 *)
TableForm[Table[h[n, k], {n, 1, z}, {k, 1, n}]]
t[n_] := Sum[h[n, k], {k, 1, n}]
Table[t[n], {n, 1, 100}] (* A194662 *)
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CROSSREFS
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Cf. A194661.
Sequence in context: A005874 A129239 A127571 * A143612 A011231 A198223
Adjacent sequences: A194659 A194660 A194661 * A194663 A194664 A194665
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling, Sep 01 2011
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STATUS
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approved
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