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A049623
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a(n) = T(n,n+3), array T as in A049615.
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4
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2, 3, 7, 12, 17, 22, 31, 38, 45, 56, 65, 74, 91, 100, 111, 130, 141, 154, 177, 190, 205, 230, 249, 264, 291, 312, 329, 360, 379, 396, 433, 452, 481, 518, 539, 570, 611, 636, 659, 704, 731, 756, 809, 834, 861, 914, 947, 978, 1031, 1066, 1099, 1154, 1199, 1232, 1291, 1336, 1371, 1436, 1469, 1502, 1575
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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T[n_, k_]:= Length[Select[Flatten[Table[{x, y}, {x, 0, n}, {y, 0, k}], 1], GCD @@ # > 1 &]]; Table[T[n, n+3], {n, 0, 65}] (* G. C. Greubel, Dec 16 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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