%I A093820
%S A093820 1,1,2,4,4,8,6,22,10,24,20,42,12,36,32,64,16,64,18,82,50,60,22,144,60,
%T A093820 48,64,96,28,172,30,282,78,64,70,256,36,72,106,254,80,204,84,176,166,88,
%U A093820 92,518,78,200,136,210,104,244,134,346,96,112,58,538,120,120,216
%N A093820 a(n) = Sum(GCD(n,a(k)): 1<=k<n) for n>1; a(1) = 1.
%C A093820 a(n) = n-1 iff n is prime.
%Y A093820 Cf. A006579.
%Y A093820 Sequence in context: A077764 A110794 A117295 this_sequence A095400 A098820 
               A062383
%Y A093820 Adjacent sequences: A093817 A093818 A093819 this_sequence A093821 A093822 
               A093823
%K A093820 nonn
%O A093820 1,3
%A A093820 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 21 2004
%E A093820 Definition corrected by Annti Karttunen ((his_firstname.his_surname(AT)iki.fi) 
               Jun 04 2004