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%I #4 Mar 30 2012 18:50:42
%S 3,7,15,19,23,27,35,39,47,55,67,75,95,99,107,119,127,135,163,179,187,
%T 195,227,235,239,243,255,267,303,319,327,347,379,407,427,443,455,459,
%U 463,479,523,539,547,555,583,607,619,635,663,667,683,687,695,715,723
%N Numbers n such that n concatenated with floor(n/2) is prime.
%C All terms are odd.
%Y Cf. A054211.
%K nonn,base
%O 1,1
%A _Reinhard Zumkeller_, Dec 28 2003
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