%I #3 Dec 05 2013 19:55:46
%S 2,4,6,3,5,7,8,9,10,12,11,13,17,19,23,14,15,16,18,20,21,29,31,37,41,
%T 43,47,53,22,24,25,26,27,28,30,32
%N 2n-1 primes followed by 2n composite numbers.
%K easy,nonn
%O 1,1
%A _Amarnath Murthy_, Nov 01 2002