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A246301
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Numbers k such that cos(k) < cos(k+1) < cos(k+2) > cos(k+3).
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4
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4, 11, 17, 23, 29, 36, 42, 48, 55, 61, 67, 73, 80, 86, 92, 99, 105, 111, 117, 124, 130, 136, 143, 149, 155, 161, 168, 174, 180, 186, 193, 199, 205, 212, 218, 224, 230, 237, 243, 249, 256, 262, 268, 274, 281, 287, 293, 300, 306, 312, 318, 325, 331, 337, 344
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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z = 520; f[x_] := f[x] = Cos[x]; t = Range[0, z];
Select[t, f[#] > f[# + 1] &] (* A026311 *)
Select[t, f[#] < f[# + 1] > f[# + 2] &] (* A246300 *)
Select[t, f[#] < f[# + 1] < f[# + 2] > f[# + 3] &] (* A246301 *)
Select[t, f[#] < f[# + 1] < f[# + 2] < f[# + 3] > f[# + 4] &] (* A246302 *)
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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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STATUS
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approved
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