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A066033 Alternating sum of primes: a(1) = A000040(1) = 2 and a(n) = a(n-1) + A000040(n)*(-1)^n for n > 1. 5
2, 5, 0, 7, -4, 9, -8, 11, -12, 17, -14, 23, -18, 25, -22, 31, -28, 33, -34, 37, -36, 43, -40, 49, -48, 53, -50, 57, -52, 61, -66, 65, -72, 67, -82, 69, -88, 75, -92, 81, -98, 83, -108, 85, -112, 87, -124, 99, -128, 101, -132, 107, -134, 117, -140, 123, -146, 125, -152, 129, -154, 139, -168, 143, -170, 147, -184, 153 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n=1..1000

FORMULA

a(n) = 4 + (-1)^n*A008347(n). - Robert Israel, Jun 14 2016

MAPLE

ListTools:-PartialSums([2, seq((-1)^n*ithprime(n), n=2..100)]); # Robert Israel, Jun 14 2016

MATHEMATICA

4 + [Accumulate[Table[Prime[n](-1)^(n), {n, 1, 70}]] (* Terry D. Grant, Jun 14 2016 *)

PROG

(PARI) { for (n=1, 1000, if (n==1, a=2, a+=prime(n)*(-1)^n); write("b066033.txt", n, " ", a) ) } \\ Harry J. Smith, Nov 07 2009

CROSSREFS

Cf. A007504, A008347, A000040.

Sequence in context: A019727 A011184 A157214 * A096319 A146105 A331165

Adjacent sequences:  A066030 A066031 A066032 * A066034 A066035 A066036

KEYWORD

sign

AUTHOR

Reinhard Zumkeller, Dec 12 2001

STATUS

approved

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Last modified February 20 04:49 EST 2020. Contains 332063 sequences. (Running on oeis4.)