%I A067541
%S A067541 1,2,1,2,2,6,2,3,4,10,2,6,6,8,4,8,6,18,4,6,10,22,4,10,12,18,6,14,8,30,
%T A067541 8,10,16,24,6,18,18,24,8,20,12,42,10,12,22,46,8,21,20,32,12,26,18,40,
%U A067541 12,18,28,58,8,30,30,36,16,24,20,66,16,22,24,70,12,36,36,40,18,30,24
%N A067541 phi(n*(n+1)/2)/phi(n) where phi is the Euler totient function A000010(n).
%F A067541 Let n=2^k*l, GCD(l, 2)=1, then a(n)=phi((n+1)/2) if k=0, phi(n+1) if 
               k=1 and phi(n+1)/2 if k>1. - Vladeta Jovovic (vladeta(AT)eunet.rs), 
               Feb 06 2002
%Y A067541 Sequence in context: A004559 A095291 A093659 this_sequence A054706 A081727 
               A000020
%Y A067541 Adjacent sequences: A067538 A067539 A067540 this_sequence A067542 A067543 
               A067544
%K A067541 nonn
%O A067541 1,2
%A A067541 Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 28 2002