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Number of numbers up to 10^n with exactly 4 divisors.
2

%I #11 Oct 03 2013 09:35:04

%S 3,32,292,2608,23327,209892,1903925,17426119,160785303,1493767176,

%T 13959963675,131125939909,1237087823423,11715901648298,

%U 111329815356516,1061057287085058

%N Number of numbers up to 10^n with exactly 4 divisors.

%H <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes in various ranges</a>

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_

%E a(14)-a(16) from _Donovan Johnson_, Oct 16 2010

%E a(15)-a(16) corrected by _Donovan Johnson_, Nov 11 2012