A072581 - OEIS

%I #4 Mar 30 2012 18:50:24

%S 19,53,139,193,311,313,409,577,641,719,787,809,1033,1061,1097,1171,

%T 1193,1289,1627,1637,1657,1669,1693,1699,1747,1811,1877,1889,2083,

%U 2089,2153,2161,2179,2203,2213,2273,2311,2659,2689,2753,3169,3677,3727,3733

%N A000040(A072578(n)).

%C A000120(a(n))=A023416(A072578(n))=A014499(n).

%e In binary representation 80='1010000' has five 0's and A000040(80)=409='110011001' has five 1's: therefore 409 is a term.

%Y Cf. A072580, A072582, A072439, A072584.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jun 23 2002