A129854 Decimal Gray code ordering of the semiprimes.

4, 6, 10, 9, 21, 22, 15, 14, 35, 38, 46, 39, 33, 34, 26, 25, 74, 77, 85, 82, 91, 93, 87, 86, 58, 62, 69, 65, 55, 57, 51, 49, 145, 146, 158, 155, 166, 169, 161, 159, 187

Offset

0,1

Comments

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

Links

Table of n, a(n) for n=0..40.

Formula

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

Crossrefs

Cf. A000040, A001358, A003188, A129543.

Sequence in context: A188673 A365448 A193951 * A088682 A102415 A117003

Adjacent sequences: A129851 A129852 A129853 * A129855 A129856 A129857

Keyword

easy,nonn

Author

Jonathan Vos Post, Jun 08 2007

Status

approved