%I #3 Mar 30 2012 18:50:44
%S 2,17,23,37,47,59,71,89,107,113,131,137,149,167,173,179,191,197,227,
%T 233,239,251,257,263,269,281,311,317,331,337,359,373,383,419,431,443,
%U 449,461,467,479,491,503,509,521,557,563,569,599,613,641,647,653,659
%N a(n+1) = smallest prime p>a(n) such that p-a(k) is not a prime power for all k<=n; a(1)=2.
%Y Cf. A000040, A000961.
%K nonn
%O 1,1
%A _Reinhard Zumkeller_, Jun 07 2004