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A160273 Successive differences (divided by 3) of the average of twin prime pairs divided by 2 (A040040). 2
1, 1, 2, 2, 3, 2, 5, 1, 5, 2, 5, 2, 1, 5, 2, 5, 2, 5, 6, 12, 2, 5, 10, 8, 5, 3, 4, 3, 25, 2, 1, 5, 4, 23, 2, 3, 2, 5, 10, 13, 8, 2, 2, 3, 18, 4, 5, 1, 20, 2, 8, 5, 4, 11, 14, 1, 9, 3, 8, 5, 9, 1, 4, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MAPLE

ZL := []; for p to 1000000 do if `and`(isprime(p), isprime(p+2)) then ZL := [op(ZL), ((p+2)^2-p^2)*(1/8)] end if end do; a := [seq((ZL[i+1]-ZL[i])*(1/3), i = 2 .. nops(ZL)-1)]

MATHEMATICA

Rest[(Differences[(Mean/@Select[Partition[Prime[Range[500]], 2, 1], #[[2]]- #[[1]]==2&])/2])/3] (* Harvey P. Dale, Jun 10 2014 *)

CROSSREFS

Cf. A040040.

Sequence in context: A153725 A102247 A054249 * A141822 A033099 A330833

Adjacent sequences:  A160270 A160271 A160272 * A160274 A160275 A160276

KEYWORD

nonn

AUTHOR

Stephen Crowley, May 07 2009

EXTENSIONS

Keyword "hard" deleted by Harvey P. Dale, Jun 10 2014

STATUS

approved

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Last modified January 23 22:36 EST 2020. Contains 331177 sequences. (Running on oeis4.)