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%I #10 Feb 22 2024 20:24:28
%S -1,0,1,3,3,9,3,11,9,21,1,29,3,29,27,33,5,47,5,51,35,49,3,69,25,63,41,
%T 69,1,93,13,77,65,85,59,113,5,101,77,119,5,143,9,121,107,119,11,169,
%U 45,157,101,149,1,189,83,173,117,163,5,227,1,179,155
%N a(n) = phi(prime(n)) - prime(phi(n)).
%t Table[EulerPhi[Prime[n]]-Prime[EulerPhi[n]],{n,70}] (* _Harvey P. Dale_, May 16 2014 *)
%Y Cf. A000010, A000040, A048849.
%K sign,easy
%O 1,4
%A _N. J. A. Sloane_.
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