

A165689


Numbers n such that pi(n) = (1/10)*n.


0




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



