0,1

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

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

Cf. A000040, A001358, A003188, A129543.

Sequence in context: A114743 A089546 A117622 this_sequence A088682 A102415 A117003

Adjacent sequences: A129851 A129852 A129853 this_sequence A129855 A129856 A129857

easy,nonn

Jonathan Vos Post (jvospost2(AT)yahoo.com), Jun 08 2007