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Search: id:A109923
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| A109923 |
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Lcm(1,2,3,...,prime(n))/[1+2+...+prime(n)]. |
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+0
1
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| 1, 4, 15, 420, 3960, 80080, 1225224, 19399380, 5354228880, 145568097675, 7600186994400, 254425307479200, 9957281351799600, 392482839950100900, 114779426083185063200, 5474978624167927514640, 312603618218620377448800
(list; graph; listen)
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OFFSET
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2,2
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EXAMPLE
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a(4)=15 because the 4th prime is 7 and lcm(1,2,3,4,5,6,7)/(1+2+3+4+5+6+7)=420/28=15.
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MAPLE
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a:=n->lcm(seq(i, i=1..ithprime(n)))/sum(j, j=1..ithprime(n)): seq(a(n), n=2..20); (Deutsch)
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CROSSREFS
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Cf. A109922.
Sequence in context: A051999 A048731 A000881 this_sequence A006524 A070037 A153064
Adjacent sequences: A109920 A109921 A109922 this_sequence A109924 A109925 A109926
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 16 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 16 2005
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