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A273960 a(n) = (-1)^n*prime(n). 0
-2, 3, -5, 7, -11, 13, -17, 19, -23, 29, -31, 37, -41, 43, -47, 53, -59, 61, -67, 71, -73, 79, -83, 89, -97, 101, -103, 107, -109, 113, -127, 131, -137, 139, -149, 151, -157, 163, -167, 173, -179, 181, -191, 193, -197, 199, -211, 223, -227, 229, -233, 239, -241, 251, -257, 263, -269, 271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..58.

FORMULA

a(n) = A000040(n)*A033999(n). - Felix Fröhlich, Jun 15 2016

EXAMPLE

a(1) = 2*(-1)^1 = -2.

a(2) = 3*(-1)^2 = 3.

a(3) = 5*(-1)^3 = -5.

MATHEMATICA

Table[Prime[n]*(-1)^n, {n, 1, 70}]

Table[If[OddQ[n], -Prime[n], Prime[n]], {n, 70}] (* Harvey P. Dale, Jul 01 2016 *)

PROG

(PARI) a(n) = prime(n)*(-1)^n \\ Felix Fröhlich, Jun 15 2016

CROSSREFS

Cf. A000040, A083236.

Sequence in context: A216884 A216885 A216886 * A100726 A015919 A064555

Adjacent sequences:  A273957 A273958 A273959 * A273961 A273962 A273963

KEYWORD

sign

AUTHOR

Terry D. Grant, Jun 12 2016

STATUS

approved

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Last modified February 24 14:41 EST 2018. Contains 299623 sequences. (Running on oeis4.)