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A166010
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a(n) = prime(n)^2-4.
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5
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0, 5, 21, 45, 117, 165, 285, 357, 525, 837, 957, 1365, 1677, 1845, 2205, 2805, 3477, 3717, 4485, 5037, 5325, 6237, 6885, 7917, 9405, 10197, 10605, 11445, 11877, 12765, 16125, 17157, 18765, 19317, 22197, 22797, 24645, 26565, 27885, 29925, 32037
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OFFSET
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1,2
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COMMENTS
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Least common multiple of prime(n)-2 and prime(n)+2.
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LINKS
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FORMULA
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MATHEMATICA
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f[n_]:=LCM[n-2, n+2]; lst={}; Do[p=Prime[n]; AppendTo[lst, f[p]], {n, 5!}]; lst
Prime[Range[5!]]^2 - 4 (* Zak Seidov, Apr 17 2012 *)
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PROG
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(Magma) [NthPrime(n)^2-4: n in [1..41]]; // Bruno Berselli, Apr 17 2012
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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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EXTENSIONS
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STATUS
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approved
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