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A075593 a(1) = 1, a(2n) = prime, a(2n+1) = composite and sum of two successive terms is alternately composite or prime. 6

%I #7 Dec 05 2013 19:55:38

%S 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 30,47,26,43,28,53,36,59,38,61,40,71,32,67,34,83,44,73,54,79,48,97,42,

%U 101,50,103,46,89,60,109,58,107,56,113,66,137,62,127,52,131,68,139,72

%N a(1) = 1, a(2n) = prime, a(2n+1) = composite and sum of two successive terms is alternately composite or prime.

%C This is not a permutation of the positive integers; odd composites > 9 will not appear in the sequence. - _Klaus Brockhaus_, Feb 06 2006

%Y Cf. A075594, A103824, A103825.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Sep 27 2002

%E Extended by _Ray Chandler_ Feb 16 2005

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)