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%I
%S 6,38,34,15,265,161,1126,4891,1253,250231,100462,49869178,234139657,
%T 68279314
%N a(n) is the smallest semiprime that belongs to a cycle of length n under repeated iteration of the map (k -> concatenation of prime divisors of k) until a non-semiprime is reached.
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_640.htm">Puzzle 640</a>
%K nonn,base,hard,more
%O 1,1
%A _Arkadiusz Wesolowski_, Jun 13 2014
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