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%I #7 Sep 08 2022 16:49:37
%S 4,5,6,6,5,10,2,7,8,9,3,11,2,3,9,8,0,17,0,10,6,6,3,17,4,3,9,6,3,17,0,
%T 9,7,2,3,21,2,0,7,12,3,12,2,8,10,4,0,21,2,8,3,4,3,19,5,8,2,6,0,31,0,0,
%U 9,10,3,10,2,5,9,8,0,28,2,3,5,0,0,16,2,16,8,4,3,18,0,3,6,12,3,25,0,5,2,0
%N Number of m such that phi(m) = 4n.
%C Size of invphi(4n) solution-set.
%e 4n=48: invphi(48) has 11 solutions: {65,104,105,112,130,140,144,156,168,180,210} The value of the "nops(invphi(4k))" number seems to take any integer except 1.
%p with(numtheory): [seq(nops(invphi(4*k)),k=1...256)];
%Y A000010, A005277.
%K nonn
%O 1,1
%A _Labos Elemer_, Jan 15 2001
%E Offset corrected by _Sean A. Irvine_, Sep 08 2022
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