%I A121111
%S A121111 277777788888899,4996238671872,438939648,4478976,338688,27648,2688,
%T A121111 768,336,54,20,0
%N A121111 Trajectory of 277777788888899 under "x -> product of digits of x" map.
%C A121111 This is the smallest number of persistence 11 (cf. A003001). It is conjectured 
               that no number has persistence greater than 11.
%H A121111 N. J. A. Sloane, <a href="http://www.research.att.com/~njas/doc/persistence.html">
               The persistence of a number</a>, J. Recreational Math., 6 (1973), 
               97-98.
%F A121111 a(n)=A121110(n-1), n>=3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 07 2008]
%Y A121111 Cf. A003001.
%Y A121111 Sequence in context: A003811 A086439 A086440 this_sequence A080125 A082589 
               A011528
%Y A121111 Adjacent sequences: A121108 A121109 A121110 this_sequence A121112 A121113 
               A121114
%K A121111 nonn,fini,full
%O A121111 1,1
%A A121111 N. J. A. Sloane (njas(AT)research.att.com), Aug 12 2006