cp's OEIS Frontend

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.

%I A091418 #1 Feb 19 2004 03:00:00
%S A091418 10,15,20,30,40,60,75,100,120,250,315,390,540,630
%N 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.
%C A091418 Sequence may be finite. Next term after 630 if it exists must be greater than 867750.
%C A091418 The terms in this sequence are those which are common to A090695 and A091417.
%e A091418 See A090695 and A091417 for examples.
%Y A091418 Cf. A090695, A091417, A091182, A091183.
%K A091418 nonn,fini
%O A091418 1,1
%A A091418 William F. Sindelar (w_sindelar(AT)juno.com), Jan 05 2004