%I A075608
%S A075608 1,9,77,27,49,33,91,51,133,39,119,69,143,21,121,57,203,93,169,63,247,81,
%T A075608 299,147,209,123,217,87,187,111,253,153,259,99,289,129,221,159,161,141,
%U A075608 301,177,319,117,329,201,287,219,361,183,343,237,581,171,341,273,323
%N A075608 a(1) = 1, a(n) = smallest composite number not occurring earlier such 
               that the concatenation a(n-1) and a(n) is a prime.
%Y A075608 Cf. A075607, A075609, A075610.
%Y A075608 Sequence in context: A056339 A056329 A082677 this_sequence A126631 A046150 
               A124131
%Y A075608 Adjacent sequences: A075605 A075606 A075607 this_sequence A075609 A075610 
               A075611
%K A075608 base,nonn
%O A075608 1,2
%A A075608 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 28 2002
%E A075608 More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Jun 23 2003