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A176628
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a(n) = prime(n) - n*(-1)^prime(n).
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2
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1, 5, 8, 11, 16, 19, 24, 27, 32, 39, 42, 49, 54, 57, 62, 69, 76, 79, 86, 91, 94, 101, 106, 113, 122, 127, 130, 135, 138, 143, 158, 163, 170, 173, 184, 187, 194, 201, 206, 213, 220, 223, 234, 237, 242, 245, 258, 271, 276, 279, 284, 291, 294, 305, 312, 319, 326
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OFFSET
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1,2
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COMMENTS
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Unit together with n-th odd prime + n + 1.
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LINKS
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FORMULA
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EXAMPLE
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a(1) = prime(1) - 1*(-1)^prime(1) = 2-1 = 1.
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MATHEMATICA
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np[n_]:=Module[{npr=Prime[n]}, npr-n (-1)^npr]; Array[np, 60] (* Harvey P. Dale, Oct 08 2011 *)
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PROG
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(Magma) [1]cat[NthPrime(n) +n: n in [2..60]]; // G. C. Greubel, Jul 01 2021
(Sage) [1]+[nth_prime(n) +n for n in (2..60)] # G. C. Greubel, Jul 01 2021
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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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