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%I A063751 #26 Nov 19 2024 13:26:17
%S A063751 1,110,7992,1111000,119998800,5759994240,1229137654864,
%T A063751 108799998912000,8007983991992016,1090799999890920000,
%U A063751 123450846932098824864,5702399999994297600000,1195941578346547072508832,111739686239998882603137600,7532766719999992467233280000
%N A063751 a(n) = phi(A002477(n)).
%H A063751 Amiram Eldar, <a href="/A063751/b063751.txt">Table of n, a(n) for n = 1..352</a> (terms 1..81 from Harry J. Smith)
%F A063751 a(n) = A000042(n) * phi(A000042(n)). - _Amiram Eldar_, Nov 19 2024
%t A063751 EulerPhi[((10^Range[20] - 1)/9)^2] (* _Paolo Xausa_, Nov 19 2024 *)
%o A063751 (PARI) j=[]; for(n=0,25,j=concat(j,eulerphi( ((10^(n+1)-1)/9)^2) )); j
%o A063751 (PARI) { for (n=0, 80, a=eulerphi(((10^(n + 1) - 1)/9)^2); write("b063751.txt", n, " ", a) ) } \\ _Harry J. Smith_, Aug 29 2009
%Y A063751 Cf. A000010, A000042, A002477.
%K A063751 nonn,changed
%O A063751 1,2
%A A063751 _Jason Earls_, Aug 11 2001
%E A063751 Offset corrected by _Amiram Eldar_, Nov 19 2024

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