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Search: id:A088726
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| A088726 |
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Smallest numbers having exactly n divisors d>1 such that also d+1 is a divisor. |
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+0
7
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| 1, 6, 12, 72, 60, 180, 360, 420, 840, 1260, 3780, 2520, 5040, 13860, 36960, 41580, 27720, 55440, 83160, 166320, 277200, 491400, 471240, 360360, 1113840, 720720, 1081080, 3341520, 2162160, 2827440, 5405400, 4324320, 12972960, 6126120
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OFFSET
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0,2
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COMMENT
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A088722(a(n))=n, A088722(k)<>n, for n<a(n).
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LINKS
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Ray Chandler, Table of n, a(n) for n=0..57
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FORMULA
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a(n) = 2*A130317(n+1) for n>0. - Chandler
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CROSSREFS
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Cf. A088722, A088723, A088724, A088725.
Sequence in context: A121735 A070970 A045780 this_sequence A163342 A107904 A071930
Adjacent sequences: A088723 A088724 A088725 this_sequence A088727 A088728 A088729
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 12 2003
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 29 2008
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