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Search: id:A119585
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| A119585 |
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Triangle where n-th row is (1,2,3,...n) arranged first by number of divisors and then numerically (among those integers with the same number of divisors). |
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+0
1
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| 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 5, 4, 1, 2, 3, 5, 4, 6, 1, 2, 3, 5, 7, 4, 6, 1, 2, 3, 5, 7, 4, 6, 8, 1, 2, 3, 5, 7, 4, 9, 6, 8, 1, 2, 3, 5, 7, 4, 9, 6, 8, 10, 1, 2, 3, 5, 7, 11, 4, 9, 6, 8, 10, 1, 2, 3, 5, 7, 11, 4, 9, 6, 8, 10, 12, 1, 2, 3, 5, 7, 11, 13, 4, 9, 6, 8, 10, 12
(list; table; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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Looking at the 9th row, we want to arrange (1,2,3,4,5,6,7,8,9). 1 has 1 divisor.
(2,3,5,7) each have 2 divisors. (4,9) each have 3 divisors. (6,8) each have 4 divisors. So the 9th row is (1)(2,3,5,7)(4,9)(6,8).
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CROSSREFS
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Sequence in context: A002260 A133994 A066041 this_sequence A066040 A066019 A051237
Adjacent sequences: A119582 A119583 A119584 this_sequence A119586 A119587 A119588
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), May 31 2006
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