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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.
1
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.
EXAMPLE
See A090695 and A091417 for examples.
CROSSREFS
KEYWORD
nonn,fini
AUTHOR
William F. Sindelar (w_sindelar(AT)juno.com), Jan 05 2004
STATUS
approved