%I
%S 5,7,31,11,5,3,809,661,139,73,521,701,131,487,89,211,733,3011,311,
%T 8837,2837,8831,1733,401,983,17881,1783,19553,13859
%N Smallest prime a such that (a*b)^2 + a*b 1 is prime with b prime = 2^(2*n)  2^n  1, see A098845 for n.
%e 2^42^21=3=b(1) prime, (3*3)^2+3*31=89 prime so a(1)=3
%e 2^82^41=239=b(2) prime, (7*239)^2+7*2391=2800601 prime so a(2)=7
%Y Cf. A098845.
%K hard,more,nonn
%O 1,1
%A _Pierre CAMI_, Jun 10 2005
