cp's OEIS Frontend

A128660 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).

%I A128660 #5 Jul 25 2013 12:34:32
%S A128660 2,6,14,15,23,31,97,144,983,2587,3163,6689
%N A128660 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).
%t A128660 Flatten[Position[#[[3]]-#[[2]]-#[[1]]+1&/@Partition[FoldList[Times,1,Prime[ Range[ 6700]]] ,3,1],_?PrimeQ]] (* _Harvey P. Dale_, Jul 25 2013 *)
%Y A128660 Cf. A002110, A128420, A128421, A128657, A128658, A128659, A128661, A128662.
%K A128660 nonn
%O A128660 1,1
%A A128660 _Pierre CAMI_, Mar 19 2007