%I A028987
%S A028987 4,6,8,44,444,888,2222,8888,444444,888888,444444444,888888888,
%T A028987 444444444444,888888888888,222222222222222222,
%U A028987 444444444444444444444444444444,44444444444444444444444444444444
%N A028987 Repdigit - 1 is prime (next term is 88...8 (72 digits)).
%H A028987 P. De Geest, <a href="http://www.worldofnumbers.com/em83.htm">Repdigits 
               : WONplate 83</a>
%Y A028987 Cf. A010785.
%Y A028987 Sequence in context: A108270 A019161 A137026 this_sequence A090938 A087271 
               A067797
%Y A028987 Adjacent sequences: A028984 A028985 A028986 this_sequence A028988 A028989 
               A028990
%K A028987 nonn,base
%O A028987 0,1
%A A028987 Patrick De Geest (pdg(AT)worldofnumbers.com)