A135716 Numbers n such that all numbers of the form p(n)#/p(k) +- 1, where 1 <= k <= n, are composite.

119, 144, 210, 245, 260, 285, 317, 352

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..8.

Formula

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

Example

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.

Prog

(PARI)

Crossrefs

Cf. A135714, A135715, A002110.

Sequence in context: A095629 A046007 A333789 * A026049 A273179 A247137

Adjacent sequences: A135713 A135714 A135715 * A135717 A135718 A135719

Keyword

nonn

Author

Rick L. Shepherd, Nov 30 2007

Status

approved