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A138402
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a(n) = (n-th prime)^4-(n-th prime)^2.
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9
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12, 72, 600, 2352, 14520, 28392, 83232, 129960, 279312, 706440, 922560, 1872792, 2824080, 3416952, 4877472, 7887672, 12113880, 13842120, 20146632, 25406640, 28392912, 38943840, 47451432, 62734320, 88519872, 104050200, 112540272
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OFFSET
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1,1
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LINKS
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FORMULA
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Product_{n>=1} (1 - 1/a(n)) = A065471.
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MATHEMATICA
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a = {}; Do[p = Prime[n]; AppendTo[a, p^4 - p^2], {n, 1, 50}]; a
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PROG
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(Magma) [NthPrime((n))^4 - NthPrime((n))^2: n in [1..30] ]; // Vincenzo Librandi, Jun 17 2011
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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