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%I #3 Mar 30 2012 16:47:32
%S 1,1,2,3,2,3,4,5,2,3,4,5,4,5,6,5,2,3,4,5,4,7,6,7,4,3,6,3,6,7,6,7,2,7,
%T 4,7,4,5,6,7,4,5,8,9,6,5,8,9,4,5,4,5,6,7,4,7,6,7,8,9,6,7,8,7,2,7,8,9,
%U 4,9,8,9,4,5,6,5,6,9,8,9
%N a(1)=1, a(n)= 1 + Sum a(p), p prime, p | n-1.
%D Suggested by Bach and Shallit, Algorithmic Number Theory, I, p. 270.
%Y Cf. A037202.
%K nonn
%O 1,3
%A _N. J. A. Sloane_.
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