%I A116887
%S A116887 5087,11173,16657,47017,54503,185243,207643,300413,306167,341813,391387,
%T A116887 849047,1348577,1438223,1502923,1857407,1909267,2121737,2161163,2288773,
%U A116887 2610133,2725157,2744723,2779097,2874463,2881327
%N A116887 Primes p that remain prime through at least 3 iterations of function 
               f(p)=p^2+4.
%e A116887 p=5087, f(p)= 25877573, f(f(p))= 669648784370333 and f(f(f(p)))= 448429494408664742387290530893 
               are all primes.
%Y A116887 Cf. A062324, A116886, A116888, A116889.
%Y A116887 Sequence in context: A160757 A046169 A058908 this_sequence A034286 A135842 
               A025398
%Y A116887 Adjacent sequences: A116884 A116885 A116886 this_sequence A116888 A116889 
               A116890
%K A116887 nonn
%O A116887 1,1
%A A116887 Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 27 2006