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Search: id:A054640
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| 3, 12, 72, 576, 6912, 96768, 1741824, 34836480, 836075520, 25082265600, 802632499200, 30500034969600, 1281001468723200, 56364064623820800, 2705475101943398400, 146095655504943513600, 8765739330296610816000
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OFFSET
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1,1
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COMMENT
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Divisor sum of primorials = Product[Prime[i]+1; {i,1,n}]
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FORMULA
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a(n+1)=a(n)*Prime[n+1]=a(n)*A028815; (quotient=nth prime+1 starting with 2)
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MAPLE
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with (numtheory):a:=n->mul(1+ithprime(j), j=1..n):seq(a(n), n=1..17); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 24 2008]
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CROSSREFS
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A002110, A000203, A028815, A054641.
Sequence in context: A103366 A020530 A052676 this_sequence A139486 A060906 A104028
Adjacent sequences: A054637 A054638 A054639 this_sequence A054641 A054642 A054643
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 15 2000
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