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Search: id:A120027
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| A120027 |
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Triangle, generated from (3^(n-k) * 5^k) table. |
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2
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| 1, 3, 5, 9, 15, 25, 27, 45, 75, 125, 81, 135, 225, 375, 625, 243, 405, 675, 1125, 1875, 3125, 729, 1215, 2025, 3375, 5625, 9375, 15625, 2187, 3645, 6075, 10125, 16875, 28125, 46875, 78125, 6561, 10935, 18225, 30375, 50625, 84375, 140625, 234375
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row 1 of the array (3, 15, 75, 375...) = A005053, (3 * 5^n), deleting the "1".
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FORMULA
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Antidiagonals of the (3^i * 5^j) multiplication table, as an array.
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EXAMPLE
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First few rows of the array are:
1, 5, 25, 125,...
3, 15, 75, 375,...
9, 45, 225, 1125,...
First few rows of the triangle are:
1;
3, 5;
9, 15, 25;
27, 45, 75, 125;
...
Example: a(17) = 675 = (3,2) in the array, = 3^3 * 5^2.
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MATHEMATICA
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Table[3^(n - k)*5^k, {n, 0, 8}, {k, 0, n}] // Flatten (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A005053.
Cf. A005053, A036561, A036565, A036566.
Sequence in context: A057289 A056754 A003593 this_sequence A018586 A135342 A029877
Adjacent sequences: A120024 A120025 A120026 this_sequence A120028 A120029 A120030
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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), Jun 04 2006
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Jun 06 2006
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