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A138403
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a(n) = p^3*(p-1), where p = prime(n).
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5
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8, 54, 500, 2058, 13310, 26364, 78608, 123462, 267674, 682892, 893730, 1823508, 2756840, 3339294, 4775858, 7741604, 11911982, 13618860, 19850358, 25053770, 28009224, 38457042, 46886534, 62037272, 87616608, 103030100, 111458154
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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)) = A065415. (End)
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MATHEMATICA
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a = {}; Do[p = Prime[n]; AppendTo[a, p^4 - p^3], {n, 1, 50}]; a
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PROG
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(Magma) [NthPrime((n))^4 - NthPrime((n))^3: n in [1..40] ]; // 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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