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A128662 Numbers n such that p(n+1)#+p(n)#-p(n-1)#+1 is prime where p(i)#=product of first i primes=A002110(i). 5
8, 13, 14, 15, 30, 41, 71, 85, 97, 132, 231, 282, 424, 509, 1346, 1348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..16.

MATHEMATICA

Flatten[Position[Partition[FoldList[Times, Prime[Range[1350]]], 3, 1], _?(PrimeQ[ #[[2]]+#[[3]]-#[[1]]+1]&), 1, Heads->False]]+1 (* Harvey P. Dale, May 30 2018 *)

CROSSREFS

Cf. A002110, A128420, A128421, A128657, A128658, A128659, A128660, A128661.

Sequence in context: A281256 A070476 A124159 * A133192 A063684 A059194

Adjacent sequences:  A128659 A128660 A128661 * A128663 A128664 A128665

KEYWORD

nonn

AUTHOR

Pierre CAMI, Mar 19 2007

STATUS

approved

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Last modified June 20 19:36 EDT 2019. Contains 324234 sequences. (Running on oeis4.)