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 A165689 Numbers n such that pi(n) = (1/10)*n. 0
 64540, 64580, 64610, 64620, 64650, 64690, 64700, 64710, 64720 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A subsequence of A057809. For each positive integer m, set of the numbers n such that pi(n)=(1/10^m)*n is a finite set. I guess that all these sets are nonempty. What is the smallest number n such that pi(n) = (1/100)*n? LINKS Table of n, a(n) for n=1..9. MATHEMATICA Select[10 Range[10000], PrimePi[ # ] == 1/10 # &] PROG (PARI) forcomposite(n=1, 1e5, if(10*primepi(n) == n, print1(n, ", "))) \\ Altug Alkan, Dec 18 2015 CROSSREFS Cf. A057809. Sequence in context: A234128 A205631 A205333 * A236469 A203712 A061738 Adjacent sequences: A165686 A165687 A165688 * A165690 A165691 A165692 KEYWORD fini,full,nonn AUTHOR Farideh Firoozbakht, Oct 06 2009 STATUS approved

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Last modified September 7 05:42 EDT 2024. Contains 375729 sequences. (Running on oeis4.)