%I A075617
%S A075617 4,1,2,3,5,6,7,8,9,10,11,12,14,13,15,16,17,18,19,20,21,22,23,24,25,26,
%T A075617 27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,50,
%U A075617 49,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72
%N A075617 Rearrangement of natural numbers so that starting with a(n) the concatenation 
               of n numbers gives a composite number.
%e A075617 4, 12, 235, 3567, etc. are composite.
%Y A075617 Cf. A075616.
%Y A075617 Sequence in context: A156915 A072046 A123609 this_sequence A055182 A084454 
               A127812
%Y A075617 Adjacent sequences: A075614 A075615 A075616 this_sequence A075618 A075619 
               A075620
%K A075617 base,nonn
%O A075617 1,1
%A A075617 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 29 2002
%E A075617 Corrected and extended by David Wasserman (dwasserm(AT)earthlink.net), 
               Jan 21 2005