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Search: id:A112790
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| A112790 |
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Array where a(1,1)=1, and m-th term of n-th row is number of terms of (n-1)th row which are coprime to the m-th divisor of n. |
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+0
2
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| 1, 1, 1, 2, 2, 2, 0, 0, 3, 1, 2, 2, 1, 1, 4, 4, 2, 0, 0, 0, 4, 1, 1, 3, 2, 3, 2, 4, 4, 2, 0, 2, 0, 0, 0, 6, 2, 2, 0, 2, 0, 4, 2, 2, 2, 4, 0, 0, 0, 0, 5, 1, 2, 2, 2, 2, 2, 2, 6, 6, 2, 0, 0, 2, 0, 0, 6, 2, 2, 2, 4, 0, 4, 0, 4, 2, 2, 0, 2, 0, 0, 0, 0, 0, 8, 2, 2, 3, 0, 3, 0, 4, 0, 0, 0, 4, 0, 0, 1, 0, 0, 6, 2, 2, 0
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OFFSET
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1,4
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COMMENT
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Number of terms in row n is A000005(n).
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EXAMPLE
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The irregular array's 5th row is [3,1]. The divisors of 6 are 1, 2, 3, and 6. In the 5th row there are 2 terms coprime to 1, 2 terms coprime to 2, 1 term coprime to 3, and 1 term coprime to 6. So the 6th row of the array is [2,2,1,1].
Array starts
1;
1,1;
2,2;
2,0,0;
3,1;
2,2,1,1;
4,4;
2,0,0,0;
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CROSSREFS
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Cf. A000005, A112791.
Sequence in context: A004541 A037864 A034852 this_sequence A110857 A108867 A095767
Adjacent sequences: A112787 A112788 A112789 this_sequence A112791 A112792 A112793
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KEYWORD
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nonn,tabf
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 31 2005
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 29 2007
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