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A093433
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a(n) = (p(1)*...*p(n)) + (p(n+1)*...*p(2n)) where p(n) is the n-th prime.
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4
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2, 5, 41, 1031, 46399, 2803043, 247140857, 25627356863, 3359824134707, 525738142728791, 86239154183764823, 16043263583368582931, 3203015861712721419161, 765364544804215147351277, 196164712685969109811322179, 51407675872783850510756055649
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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a(5) = 2803043 because 2*3*5*7*11 + 13*17*19*23*29 = 2803043.
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MAPLE
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a:= n-> add(mul(ithprime(i+j), i=1..n), j=[0, n]):
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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