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Search: id:A136181
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| A136181 |
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Irregular array read by rows: row n contains the LCMs of each pair of consecutive positive divisors of n. |
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+0
5
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| 2, 3, 2, 4, 5, 2, 6, 6, 7, 2, 4, 8, 3, 9, 2, 10, 10, 11, 2, 6, 12, 12, 12, 13, 2, 14, 14, 3, 15, 15, 2, 4, 8, 16, 17, 2, 6, 6, 18, 18, 19, 2, 4, 20, 10, 20, 3, 21, 21, 2, 22, 22, 23, 2, 6, 12, 12, 24, 24, 24, 5, 25, 2, 26, 26, 3, 9, 27, 2, 4, 28, 14, 28, 29, 2, 6, 15, 30, 30, 30, 30, 31, 2, 4
(list; table; graph; listen)
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OFFSET
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2,1
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COMMENT
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Each row has d(n)-1 terms, where d(n) is the number of positive divisors of n. The first row listed is row 2.
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LINKS
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Diana Mecum, Table of n, a(n) for n=2,...,6070
Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The positive divisors of 20 are 1,2,4,5,10,20. LCM(1,2)=2. LCM(2,4)=4. LCM(4,5)=20. LCM(5,10)=10. And LCM(10,20)=20. So row 20 is (2,4,20,10,20).
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CROSSREFS
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Cf. A136178, A136182, A136183.
Sequence in context: A120499 A027749 A029638 this_sequence A003976 A161908 A026358
Adjacent sequences: A136178 A136179 A136180 this_sequence A136182 A136183 A136184
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet Dec 19 2007
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EXTENSIONS
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Added terms a(24) - a(6069). - Diana Mecum (diana.mecum(AT)gmail.com), Dec 29 2008
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