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A120438 Average of twin-prime pairs modulo 10 (least absolute residue). 0
4, -4, 2, -2, 0, 2, 0, 2, 2, -2, -2, 0, 0, 2, -2, -2, 0, 0, 2, 2, -2, 0, 2, 2, 2, 0, 0, -2, 2, 0, 0, 2, -2, -2, 2, 0, 2, 0, 2, 2, 2, 0, -2, 0, 2, 0, -2, 2, 2, -2, -2, 0, -2, -2, 2, -2, 2, -2, 2, 0, -2, -2, 2, -2, 2, 0, 2, -2, -2, 0, 0, 2, 0, 2, -2, -2, 2, 0, 0, 2, 0, 0, 0, -2, 2, -2, 0, 0, 0, 2, 0, 2, -2, -2, 0, -2, 2, 2, -2, 2, 2, -2, 0, 2, 0, 0, 2, -2, -2, -2, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms after a(2) are 0, 2, or -2. - Franklin T. Adams-Watters, Aug 27 2012

LINKS

Table of n, a(n) for n=1..111.

EXAMPLE

First twin-prime average = (3+5)/2 = 4: a(1) = +4.

Second twin-prime average = (5+7)/2 = 6 (= -4+1*10): a(2) = -4.

Third twin-prime average = (11+13)/2 = 12 (= 2+1*10): a(3) = +2.

CROSSREFS

Cf. A014574.

Sequence in context: A182781 A291085 A193556 * A192977 A038800 A126712

Adjacent sequences: A120435 A120436 A120437 * A120439 A120440 A120441

KEYWORD

sign

AUTHOR

Greg Huber, Jul 18 2006

EXTENSIONS

Edited by Franklin T. Adams-Watters, Aug 27 2012

STATUS

approved

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Last modified November 26 18:21 EST 2022. Contains 358362 sequences. (Running on oeis4.)