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Search: id:A054521
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| A054521 |
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Triangle T(n,k): T(n,k)=1 if GCD(n,k) = 1, T(n,k)=0 otherwise (n >= 1, 1<=k<=n). |
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+0
42
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| 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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Row sums = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), May 20 2007
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CROSSREFS
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Cf. A051731, A054522, ...
Cf. A054521.
Sequence in context: A143242 A136442 A128431 this_sequence A014240 A014471 A071028
Adjacent sequences: A054518 A054519 A054520 this_sequence A054522 A054523 A054524
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KEYWORD
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nonn,tabl
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Apr 09 2000
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