Search: id:A078558
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%I A078558
%S A078558 1,2,8,48,96,1152,9216,1658880,3317760,92897280,2786918400,
%T A078558 100329062400,802632499200,370816214630400,741632429260800,
%U A078558 2966529717043200,29665297170432000,355983566045184000
%N A078558 GCD of sigma[A002110(n)] and phi[A002110(n)].
%F A078558 a(n)=GCD[A000203[A002110(n)], A000005[A002110(n)]]= GCD[A005867(n), A054640(n)]
%e A078558 m=2,3,30,210 primorials are balanced numbers so theses GCD() equals phi(): 
               a[m]=1,2,8,48 (see A005867).
%Y A078558 Cf. A000203, A002110, A000005, A005867, A054640, A020492.
%Y A078558 Sequence in context: A145846 A009566 A003275 this_sequence A003032 A058928 
               A004141
%Y A078558 Adjacent sequences: A078555 A078556 A078557 this_sequence A078559 A078560 
               A078561
%K A078558 nonn
%O A078558 1,2
%A A078558 Labos E. (labos(AT)ana.sote.hu), Dec 06 2002

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