%I A075593
%S A075593 1,3,4,2,9,5,6,19,10,11,8,7,12,13,16,17,14,31,22,23,18,37,24,41,20,29,
%T A075593 30,47,26,43,28,53,36,59,38,61,40,71,32,67,34,83,44,73,54,79,48,97,42,
%U A075593 101,50,103,46,89,60,109,58,107,56,113,66,137,62,127,52,131,68,139,72
%N A075593 a(1) = 1, a(2n) = prime, a(2n+1) = composite and sum of two successive 
               terms is alternately composite or prime.
%C A075593 This is not a permutation of the positive integers; odd composites > 
               9 will not appear in the sequence. - Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), 
               Feb 06 2006
%Y A075593 Cf. A075594, A103824, A103825.
%Y A075593 Sequence in context: A082362 A082364 A091477 this_sequence A145421 A019474 
               A072565
%Y A075593 Adjacent sequences: A075590 A075591 A075592 this_sequence A075594 A075595 
               A075596
%K A075593 nonn
%O A075593 1,2
%A A075593 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 27 2002
%E A075593 Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) Feb 16 2005