%I A057951
%S A057951 2,3,4,4,4,7,4,6,6,6,4,9,5,6,8,8,4,11,3,9,9,9,3,12,7,8,9,10,7,15,5,13,
%T A057951 8,8,9,14,5,5,8,13,6,17,6,13,12,8,4,15,6,12,10,11,6,16,10,14,8,10,4,22,
%U A057951 9,7,16,17,9,17,5,12,8,14,4,20,5,9,14,8,10,18,8,17,15,9,5,24,9,10,12
%N A057951 Number of prime factors of 10^n - 1 (counted with multiplicity).
%C A057951 a(n) = Omega(10^n -1) = Omega(R_n) + 2 = A046053(n) + 2 {where Omega(n)=A001222(n) 
               and R_n=(10^n -1)/9=A002275(n)}. - Lekraj Beedassy (blekraj(AT)yahoo.com), 
               Jun 09 2006
%H A057951 S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/
               cun/main600">Main Tables</a> from the Cunningham Project.
%H A057951 S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/
               cun/index.html">The Cunningham Project</a>
%F A057951 Mobius transform of A085035 - T. D. Noe (noe(AT)sspectra.com), Jun 19 
               2003
%Y A057951 Cf. A057952-A057958, A046051.
%Y A057951 Cf. A085035.
%Y A057951 Sequence in context: A131798 A114212 A108355 this_sequence A076410 A058277 
               A065852
%Y A057951 Adjacent sequences: A057948 A057949 A057950 this_sequence A057952 A057953 
               A057954
%K A057951 nonn
%O A057951 1,1
%A A057951 Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 2000.