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Primes and composite numbers alternately in increasing order.
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%I #2 Dec 05 2013 19:57:05

%S 2,4,5,6,7,8,11,12,13,14,17,18,19,20,23,24,29,30,31,32,37,38,41,42,43,

%T 44,47,48,53,54,59,60,61,62,67,68,71,72,73,74,79,80,83,84,89,90,97,98,

%U 101,102,103,104,107,108,109,110

%N Primes and composite numbers alternately in increasing order.

%C 3 is the only prime missing. p and p+1 where p is a prime.

%K easy,nonn

%O 1,1

%A _Amarnath Murthy_, Aug 17 2005