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a(n) = A005278(n)/2.
1

%I #7 Sep 05 2019 11:09:27

%S 5,13,17,25,26,29,43,50,58,61,65,67,73,77,85,86,93,101,103,109,111,

%T 116,122,130,133,134,137,145,146,149,155,163,170,172,173,181,183,186,

%U 193,197,202,206,218,233,235,237,241,245,259,260,266,267,268,273,277,281

%N a(n) = A005278(n)/2.

%Y Cf. A005278.

%K nonn

%O 1,1

%A _Artur Jasinski_, Dec 30 2006

%E More terms from _Amiram Eldar_, Sep 05 2019