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A145315 Numbers n for which the set {30*n-13, 30*n-11, 30*n-7, 30*n-1, 30*n+1, 30*n+7, 30*n+11, 30*n+13} forms a symmetrical prime octuplet. 1
1, 43, 3772, 86022, 691263, 1940280, 2445785, 2539018, 3355288, 4492167, 4598112, 5517709, 5731956, 7466941, 8409234, 9817872, 10324700, 10390862, 12138468, 13631232, 17181592, 17382707, 17609073, 20633677, 20897582, 22760333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

N is always +/- 1 (mod 7).

LINKS

Table of n, a(n) for n=1..26.

MATHEMATICA

spoQ[n_]:=Module[{c=30n}, And@@PrimeQ[{c-13, c-11, c-7, c-1, c+1, c+7, c+11, c+13}]]; Select[Range[23000000], spoQ] (* Harvey P. Dale, Oct 10 2011 *)

CROSSREFS

Sequence in context: A246535 A265234 A015323 * A110704 A060485 A081795

Adjacent sequences:  A145312 A145313 A145314 * A145316 A145317 A145318

KEYWORD

nonn

AUTHOR

Andrey V. Kulsha, Oct 07 2008

STATUS

approved

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Last modified April 22 22:22 EDT 2019. Contains 322378 sequences. (Running on oeis4.)