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#25 by Harvey P. Dale at Fri Jul 01 11:46:52 EDT 2016
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#24 by Harvey P. Dale at Fri Jul 01 11:46:45 EDT 2016
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| MATHEMATICA
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Table[If[OddQ[n], -Prime[n], Prime[n]], {n, 70}] (* Harvey P. Dale, Jul 01 2016 *)
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| STATUS
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approved
editing
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#23 by N. J. A. Sloane at Fri Jun 17 09:44:54 EDT 2016
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#22 by N. J. A. Sloane at Fri Jun 17 09:44:53 EDT 2016
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| NAME
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a(n) = prime(n)*(-) = (-1)^n*prime(n.).
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| STATUS
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approved
editing
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#21 by N. J. A. Sloane at Fri Jun 17 09:44:25 EDT 2016
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#20 by N. J. A. Sloane at Fri Jun 17 09:44:17 EDT 2016
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| EXAMPLE
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a(1) = () = 2)((-*(-1)^1) = - = -2.
a(2) = () = 3)((-*(-1)^2) = = 3.
a(3) = () = 5)((-*(-1)^3) = - = -5.
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| STATUS
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approved
editing
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Discussion
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| Fri Jun 17
| 09:44
| N. J. A. Sloane: Edited
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#19 by N. J. A. Sloane at Fri Jun 17 09:43:01 EDT 2016
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#18 by N. J. A. Sloane at Fri Jun 17 09:42:58 EDT 2016
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| NAME
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Prime Numbers with Alternating Signs, prime(n)*(-1)^n for n>0.
a(n) = prime(n)*(-1)^n.
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| FORMULA
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a(n) = (prime(n))((-1)^n), for n>0 where prime(n) = A000040(n).
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| STATUS
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proposed
editing
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#17 by Felix Fröhlich at Wed Jun 15 10:26:27 EDT 2016
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#16 by Felix Fröhlich at Wed Jun 15 10:17:45 EDT 2016
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