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A349317
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Triangle T(n,k): T(n,k) = 1 if gcd(n, k) > 1, else 0.
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1
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0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
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OFFSET
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1
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COMMENTS
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Characteristic function of k in the cototient of n, i.e., of A169582: a(A169582(n)) = 1; a(A169581(n)) = 0.
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LINKS
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FORMULA
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A066570 = Product of k in row n such that T(n,k)=1
Inverse of A054521 = S(n,k); T(n,k) = 1 - S(n,k).
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EXAMPLE
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Table T(n,k) for 1 <= n <= 16, replacing 0 with "." for clarity:
1: .
2: . 1
3: . . 1
4: . 1 . 1
5: . . . . 1
6: . 1 1 1 . 1
7: . . . . . . 1
8: . 1 . 1 . 1 . 1
9: . . 1 . . 1 . . 1
10: . 1 . 1 1 1 . 1 . 1
11: . . . . . . . . . . 1
12: . 1 1 1 . 1 . 1 1 1 . 1
13: . . . . . . . . . . . . 1
14: . 1 . 1 . 1 1 1 . 1 . 1 . 1
15: . . 1 . 1 1 . . 1 1 . 1 . . 1
16: . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1
---------------------------------------------------
n\k 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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MATHEMATICA
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Table[Boole[GCD[n, k] > 1], {n, 13}, {k, n}] // Flatten
(* Generate up to 4096 rows = 8390656 terms from data stored in the bitmap: *)
With[{rows = 150, s = ImageData[Import["https://oeis.org/A349317/a349317_1.png"]]}, Array[s[[#, 1 ;; #]] /. {0. -> 1, 1. -> 0} &, rows]] (* Michael De Vlieger, Dec 08 2021 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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