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A079266
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Subprimorials, extrapolation from primorials by analogy with subfactorials.
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2
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0, 1, 2, 11, 77, 850, 11047, 187806, 3568317, 82071280, 2380067130, 73782081030, 2729936998114, 111927416922654, 4812878927674125, 226205309600683885, 11988881408836245894, 707344003121338507758, 43147984190401648973266
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = Round(Prime(n)#/e), where p# = p primorial, with Prime(0)# = 1.
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EXAMPLE
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a(3) = 11 because Prime(3) = 5, 5# = 30, 30/e = 11.036...
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MATHEMATICA
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Join[{0}, Round[FoldList[Times, Prime[Range[20]]]/E]] (* Harvey P. Dale, Oct 22 2023 *)
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CROSSREFS
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See A121572 for a different definition of subprimorial.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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