%I A109800
%S A109800 2,3,7,9,33,61,93,112,284,615,1293,2558,2925,5961,6454,7960,17521
%N A109800 Numbers n such that 55*10^n + 1 is prime.
%C A109800 All values proved prime. No more up to 25000. Primality proof for the 
               largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] 
               Primality testing 55*10^17521+1 [N-1, Brillhart-Lehmer-Selfridge] 
               Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge 
               with factored part 69.89% 55*10^17521+1 is prime! (48.1892s+0.1481s)
%Y A109800 Cf. A056806, A056805.
%Y A109800 Sequence in context: A024541 A123481 A107861 this_sequence A152136 A059180 
               A051637
%Y A109800 Adjacent sequences: A109797 A109798 A109799 this_sequence A109801 A109802 
               A109803
%K A109800 more,nonn
%O A109800 1,1
%A A109800 Jason Earls (zevi_35711(AT)yahoo.com), Aug 15 2005