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%I
%S 64540,64580,64610,64620,64650,64690,64700,64710,64720
%N Numbers n such that pi(n)=(1/10)*n.
%C A subsequence of A057809. For each positive integer m, set of the numbers n
%C such that pi(n)=(1/10^m)*n is a finite set. I guess that all these sets are
%C nonempty. What is the smallest number n such that pi(n)=(1/100)*n?
%t Select[10 Range[10000], PrimePi[ # ] == 1/10 # &]
%Y Cf. A057809,
%K fini,full,nonn
%O 1,1
%A _Farideh Firoozbakht_, Oct 06 2009
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