A129854 - OEIS

%I #5 Jul 11 2015 16:48:43

%S 4,6,10,9,21,22,15,14,35,38,46,39,33,34,26,25,74,77,85,82,91,93,87,86,

%T 58,62,69,65,55,57,51,49,145,146,158,155,166,169,161,159,187

%N Decimal Gray code ordering of the semiprimes.

%C Semiprime analog of A129543. Semiprimes (A001358) whose indices are permuted by the decimal equivalent of the Gray code ordering of the nonnegative integers.

%F a(n) = A001358(1+A003188(n)).

%Y Cf. A000040, A001358, A003188, A129543.

%K easy,nonn

%O 0,1

%A _Jonathan Vos Post_, Jun 08 2007