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