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Search: id:A131120
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| A131120 |
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a(1)=1. a(n+1) = n!/LCM(a(1),a(2),...,a(n)). |
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+0
2
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| 1, 1, 2, 3, 4, 10, 12, 84, 96, 108, 120, 1320, 1440, 18720, 20160, 151200, 483840, 1028160, 1088640, 2298240, 2419200, 50803200, 159667200, 1836172800, 1916006400, 11975040000, 12454041600, 336259123200, 348713164800
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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The LCM of the first 7 terms is 60. So a(8) = 7!/60 = 84.
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MAPLE
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A131120 := proc(n) option remember ; if n = 1 then 1; else (n-1)!/lcm(seq(A131120(i), i=1..n-1)) ; fi ; end: seq(A131120(n), n=1..40) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 17 2007
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CROSSREFS
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Cf. A131121.
Sequence in context: A049548 A005456 A100773 this_sequence A115195 A095384 A115899
Adjacent sequences: A131117 A131118 A131119 this_sequence A131121 A131122 A131123
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 15 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 17 2007
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