%I
%S 2,3,5,11,17,23,31,37,43,79,193,491,503,653,883,1201,10607,19009,
%T 19469,19489,34963,35809,46499,223273,223313,391231,409817,410731,
%U 532159,634061,754549,1383769,1389533,2552621,2555753,3311233,4477453,4700621
%N Prime differences of tribonacci numbers.
%C A113238 is the difference set of tribonacci numbers. A113188A113194 deal with difference sets of Fibonacci numbers and Lucas numbers and primes in those difference sets.
%F a(n) = intersection of primes A000040 and difference set of tribonacci numbers A113238. Positive prime values of {A000073(i)  A000073(j) such that i>=j}.
%e a(1) = 2 because 4  2 = 2 where 4 and 2 are tribonacci numbers.
%e a(2) = 3 because 7  4 = 3 where 7 and 4 are tribonacci numbers.
%e a(3) = 5 because 7  2 = 5 where 7 and 2 are tribonacci numbers.
%e a(4) = 11 because 13  2 = 11 where 13 and 2 are tribonacci numbers.
%e a(5) = 17 because 24  7 = 17 where 24 and 7 are tribonacci numbers.
%Y Cf. A000040, A000073, A113188A113194, A113238.
%K easy,nonn
%O 1,1
%A _Jonathan Vos Post_, Oct 19 2005
