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A088618 Rearrangement of odd numbers such that every concatenation of at least two terms is composite. 0

%I #5 Dec 05 2013 19:56:34

%S 1,5,13,3,15,9,17,7,23,19,25,35,21,39,37,11,33,45,27,47,31,51,41,55,

%T 29,43,61,59,57,53,49,63,65,75,67,71,69,79,77,81,73,85,91,95,83,97,

%U 105,87,101,99,115,107,93,123,111,117,113,109,119,103,121,125,129,135,133,137

%N Rearrangement of odd numbers such that every concatenation of at least two terms is composite.

%C Conjecture: Sequence is infinite. And every odd number is a member.

%e 15,513,133,315,1513,5133,13315,15133,513315,1513315 all are composite.

%K base,nonn

%O 1,2

%A _Amarnath Murthy_, Oct 17 2003

%E More terms from _Ray Chandler_, Oct 18 2003

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)