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%I #7 Mar 14 2018 06:01:01
%S 1,2,2,3,3,4,4,5,5,6,6,7,7,7,7,8,8,9,9,10,10,11,11,12,12,12,12,13,13,
%T 14,14,15,15,15,15,16,16,16,16,17,17,18,18,19,19,20,20,21,21,21,21,22,
%U 22,23,23,24,24,25,25,26,26,26,26,27,27,28,28,28,28
%N Number of numbers k <= n such that phi(m) = k for some m.
%C Partial sums of A264739;
%C a(n) = n - A180639(n).
%H Reinhard Zumkeller, <a href="/A264810/b264810.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a264810 n = a264810_list !! (n-1)
%o a264810_list = scanl1 (+) a264739_list
%o (PARI) first(n)=my(s); vector(n,k,s+=istotient(k)) \\ _Charles R Greathouse IV_, Sep 02 2015
%Y Cf. A000010, A002202, A264739.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Nov 26 2015
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