A067014 - OEIS

%I #3 Mar 30 2012 18:50:19

%S 1,2,2,3,4,5,6,7,9,11,13,23,25,43,47,53,59,111,77,171,115,111,83,193,

%T 199,369,263,373,395,685,551,1189,1173,875,653,845,647,1491,951,825,

%U 453,1125,623,1653,1179,973,939,1597,1649,2661

%N a(1)=1 and a(n+1)=phi(a(n))+a(phi(n)) for n>0.

%e a(4)=phi(a(3))+a(phi(3))=phi(phi(a(2))+a(phi(2)))+a(2)=

%e =phi(phi(phi(a(1))+a(phi(1)))+a(1))+phi(a(1))+a(phi(1))=

%e =phi(phi(phi(1)+a(1))+1)+phi(1)+a(1)=

%e =phi(phi(1+1)+1)+1+1=phi(phi(2)+1)+2=phi(1+1)+2=1+2=3.

%Y Cf. A000010.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Feb 16 2002