1,1

p(k) is k-th prime; p(n)# is n-th primorial, A002110(n). No more terms <= 500.

Numbers n such that A135714(n)+A135715(n)=0.

119 is a term as p(119)#/p(k)+1 is composite for all 1 <= k <= 119 and p(119)#/p(k)-1 is likewise composite for the same k values; there are 238 such composite numbers.

(PARI)

Cf. A135714, A135715, A002110.

Sequence in context: A039557 A095629 A046007 this_sequence A026049 A134603 A134604

Adjacent sequences: A135713 A135714 A135715 this_sequence A135717 A135718 A135719

nonn

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Nov 30 2007