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Search: id:A133994
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| A133994 |
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Irregular array read by rows: n-th row contains (in numerical order) both the divisors of n and the positive integers <= n which are coprime to n. |
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2
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| 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5, 1, 2, 3, 5, 6, 1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 7, 8, 1, 2, 3, 4, 5, 7, 8, 9, 1, 2, 3, 5, 7, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 3, 4, 5, 6, 7, 11, 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 3, 5, 7, 9, 11, 13, 14
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row n contains A073757(n) terms.
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The divisors of 12 are: 1,2,3,4,6,12. The positive integers which are <= 12 and are coprime to 12 are: 1,5,7,11. So row 12 is the union of these two lists: 1,2,3,4,5,6,7,11,12.
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CROSSREFS
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Cf. A133995, A073757.
Sequence in context: A136261 A140756 A002260 this_sequence A066041 A119585 A066040
Adjacent sequences: A133991 A133992 A133993 this_sequence A133995 A133996 A133997
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KEYWORD
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nonn,tabf
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AUTHOR
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Leroy Quet Oct 01 2007
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