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Search: id:A143271
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| 1, 2, 4, 2, 4, 6, 3, 6, 9, 12, 2, 4, 6, 8, 10, 4, 8, 12, 16, 20, 24, 2, 4, 6, 8, 10, 12, 14, 4, 8, 12, 16, 20, 24, 28, 32, 3, 6, 9, 12, 15, 18, 21, 24, 27, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 2, 4, 6, 8, 10, 12, 146, 16, 18, 20, 22, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A143272: (1, 6, 12, 30, 30, 84, 56,...).
Left border = A000005: (1, 2, 2, 3, 2, 4, 2, 4, 3,...).
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FORMULA
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Triangle read by rows, A130209 * A000012 * A127648, 1<=k<=n. T(n,k) = d(n)*k
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EXAMPLE
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First few rows of the triangle =
1;
2, 4;
2, 4, 6;
3, 6, 9, 12;
2, 4, 6, 8, 10;
4, 8, 12, 16, 20, 24;
2, 4, 6, 8, 10, 12, 14;
...
T(5,3) = 6 = 2*3 = d(5)*3
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CROSSREFS
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Cf. A000005, A143272, A130209, A127648.
Sequence in context: A047947 A018838 A116982 this_sequence A128859 A047975 A112791
Adjacent sequences: A143268 A143269 A143270 this_sequence A143272 A143273 A143274
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 03 2008
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