A091418 Integers n which are not the sum or difference of 2 integers A and B where A is less than or equal to n such that AB+1 and AB-1are both primes. In other words, the product A*B cannot be the middle integer of a twin prime pair.

10, 15, 20, 30, 40, 60, 75, 100, 120, 250, 315, 390, 540, 630

Offset

1,1

Comments

Sequence may be finite. Next term after 630 if it exists must be greater than 867750.

The terms in this sequence are those which are common to A090695 and A091417.

Links

Table of n, a(n) for n=1..14.

Example

See A090695 and A091417 for examples.

Crossrefs

Cf. A090695, A091417, A091182, A091183.

Sequence in context: A129495 A101258 A344330 * A055986 A045161 A105156

Adjacent sequences: A091415 A091416 A091417 * A091419 A091420 A091421

Keyword

nonn,fini

Author

William F. Sindelar (w_sindelar(AT)juno.com), Jan 05 2004

Status

approved