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%I
%S 2,2,2,4,4,6,6,8,8,8,16,18,12,20,16,18,16,30,32,24,36,32,24,24,42,32,
%T 48,36,40,36,64,40,44,48,40,72,78,80,48,56,48,72,64,96,60,80,104,96,
%U 72,88,72,64,110,72,84,80,72,128,138,92,140,84,120,96,156,104,164,156,112,120,116
%N phi(p+1), p prime.
%p for i from 1 to 500 do if isprime(i) then print(phi(i+1)); fi; od;
%Y Cf. A000010.
%K nonn
%O 2,1
%A _N. J. A. Sloane_.
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