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A059863
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a(n) = Product_{i=3..n} (prime(i)-4).
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1
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1, 1, 1, 3, 21, 189, 2457, 36855, 700245, 17506125, 472665375, 15597957375, 577124422875, 22507852492125, 967837657161375, 47424045200907375, 2608322486049905625, 148674381704844620625, 9366486047405211099375, 627554565176149143658125, 43301264997154290912410625
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OFFSET
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1,4
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REFERENCES
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Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 84-94.
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LINKS
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PROG
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(PARI) a(n) = prod(i=3, n, prime(i)-4); \\ Michel Marcus, Aug 25 2019
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CROSSREFS
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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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