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A122414
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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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2
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0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0
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OFFSET
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1,1
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COMMENTS
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First column is all zeros, main diagonal is A010051 (characteristic function of primes).
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LINKS
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Table of n, a(n) for n=1..105.
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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, if(isprime(gcd(n, k)), 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. A010051, A122415.
Row sums are in A117494. [From Klaus Brockhaus, May 29 2009]
Sequence in context: A072785 A074937 A143518 * A144605 A154103 A116178
Adjacent sequences: A122411 A122412 A122413 * A122415 A122416 A122417
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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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