

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 AB1are both primes. In other words, the product A*B cannot be the middle integer of a twin prime pair.


1



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



EXAMPLE



CROSSREFS



KEYWORD

nonn,fini


AUTHOR

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


STATUS

approved



