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A129854 Decimal Gray code ordering of the semiprimes. 0
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 (list; graph; refs; listen; history; text; internal format)
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
FORMULA
a(n) = A001358(1+A003188(n)).
CROSSREFS
Sequence in context: A188673 A365448 A193951 * A088682 A102415 A117003
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Jun 08 2007
STATUS
approved

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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)