%I A153092
%S A153092 1,1,1,1,3,2,3,2,20,4,5,2,9,2,27,7,12,3,3,2,3,6,6,1,18,8,2,17,2,14,55,
               1,
%T A153092 18,4,59,18,30,26,32,3,14,59,42,35,40,22,7,17,26,6,28,3,15,11,6,32,30,
%U A153092 18,14,4,85,3,1,65,13,64,7,18,40,8,68,5,5,6,107,7,88,25,6,3,1,21,8,12,
               9
%N A153092 Least k(n) such that k(n)*6^n*(6^n-1)+j is prime with j= -1 or 1 or both
%C A153092 When n increases sum k(n) for i=1 to n / sum n for i=1 to n tends to 
               log(6)/4.5
%H A153092 Pierre CAMI, <a href="b153092.txt">Table of n, a(n) for n = 1..1000</
               a>
%e A153092 1*6^1*(6^1-1)-1=29 prime as 31 so k(1)=1
%Y A153092 A152414, A152090, A152091, A152093, A152094, A152095
%Y A153092 Sequence in context: A165258 A092962 A112924 this_sequence A165601 A054263 
               A124874
%Y A153092 Adjacent sequences: A153089 A153090 A153091 this_sequence A153093 A153094 
               A153095
%K A153092 nonn
%O A153092 1,5
%A A153092 Pierre CAMI (pierre-cami(AT)orange.fr), Dec 18 2008