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Search: id:A109849
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| A109849 |
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a(1) = 1 a(2) = 2, a(n) = LCM of n and a(n-2), a(n+1)= LCM of (n+1) and a(n-3) and so on until a(2n-1) = LCM of (2n-1) and a(1). Then a(2n) = LCM of 2n and a(2n-2) and so on. |
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+0
2
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| 1, 2, 3, 4, 5, 12, 21, 8, 9, 40, 231, 12, 65, 28, 15, 16, 17, 144, 285, 140, 1365, 132, 5313, 120, 225, 104, 189, 84, 145, 60, 93, 32, 33, 544, 3255, 180, 5365, 1596, 2457, 520, 9225, 840, 228459, 132, 4095, 3220, 13395, 144, 833, 400, 255, 364, 3445, 108, 1155
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Another bootstrap sequence. 12 appears twice.
12 60 65 104 120 132 144 252 255 400 912 1008 1020 1980 2112 2457 4092 4095 ... are the smallest numbers that appear twice, with 4095 being the smallest number that appears three times. - Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 04 2006
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CROSSREFS
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Cf. A109850.
Sequence in context: A057472 A117577 A069469 this_sequence A007662 A109744 A065635
Adjacent sequences: A109846 A109847 A109848 this_sequence A109850 A109851 A109852
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 06 2005
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EXTENSIONS
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More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 04 2006
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