Search: id:A143408
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%I A143408
%S A143408 2,6,12,16,4,8,84,32,40,32,8,20,20,64,8,480,80,48,12,8,160,20,16,4,8,
%T A143408 1216,8,64,16,872,24,160,8,532,52,120,12,424,100,24,4,8,944,24,144,12,
%U A143408 1912,272,8,16,276,24,64,144,1856,20,96,1276,40,112,12,8,116,20,16,96,
               8
%N A143408 Number of numbers k such that the reduced totient function psi(k) = A002174(n).
%C A143408 a(n) is the number of divisors of A143407(n) that are not divisors of 
               A143407(r) for r<n.
%H A143408 T. D. Noe, <a href="b143408.txt">Table of n, a(n) for n=1..500</a>
%e A143408 Because A002174(5)=8 and psi(k)=8 for k=32,96,160,480, we have a(5)=4.
%Y A143408 Cf. A002322 (reduced totient function).
%Y A143408 Sequence in context: A152389 A114103 A065154 this_sequence A088915 A084790 
               A130237
%Y A143408 Adjacent sequences: A143405 A143406 A143407 this_sequence A143409 A143410 
               A143411
%K A143408 nonn
%O A143408 1,1
%A A143408 T. D. Noe (noe(AT)sspectra.com), Aug 13 2008

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