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A122415
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Triangle T(n,k) for 1 < k < n read by rows, where T(n,k) = 1 if gcd(n,k) is prime, 0 otherwise.
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1
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0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0
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OFFSET
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3,1
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COMMENTS
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Triangle defined in A122414 without first column and main diagonal.
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LINKS
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Table of n, a(n) for n=3..107.
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PROG
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(PARI) {m=14; v=vector(m, x, vector(x)); for(n=1, m, for(k=1, n-1, if(isprime(gcd(n+2, k+1)), v[n][k]=1))); for(n=1, m, for(k=1, n, print1(v[n][k], ", ")))}
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CROSSREFS
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Cf. A122414.
Row sums are in A087625. [From Klaus Brockhaus, May 29 2009]
Sequence in context: A132151 A103588 A153638 * A109017 A110161 A134667
Adjacent sequences: A122412 A122413 A122414 * A122416 A122417 A122418
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KEYWORD
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nonn,tabl
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AUTHOR
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Klaus Brockhaus, Sep 03 2006
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STATUS
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approved
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