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A281377 Write n in Elias's omega code, interchange the 1's and 0's and convert it back to decimal. 1
1, 3, 1, 23, 21, 19, 17, 15, 13, 11, 9, 7, 5, 3, 1, 735, 733, 731, 729, 727, 725, 723, 721, 719, 717, 715, 713, 711, 709, 707, 705, 1343, 1341, 1339, 1337, 1335, 1333, 1331, 1329, 1327, 1325, 1323, 1321, 1319, 1317, 1315, 1313, 1311, 1309, 1307, 1305, 1303, 1301, 1299, 1297, 1295, 1293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Indranil Ghosh, Table of n, a(n) for n = 1..10000

EXAMPLE

For n = 10, the Elias omega code for n is '1110100', which after interchanging the 1's and 0's becomes '0001011'. Now, 1011_2 = 11_10. So, a(10) = 11.

PROG

(Python)

def a(n):

....s=""

....for i in A281193(n):

........if i=="1":

............s+="0"

........else:

............s+="1"

....return int(s, 2)

CROSSREFS

Cf. A035327, A054429 (n is converted to Elias gamma code, the 1's and 0's are interchanged and the code is converted back to decimal, for n>1), A281193, A281313.

Sequence in context: A270277 A271605 A270220 * A138654 A175289 A072271

Adjacent sequences:  A281374 A281375 A281376 * A281378 A281379 A281380

KEYWORD

nonn,base

AUTHOR

Indranil Ghosh, Jan 21 2017

STATUS

approved

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Last modified October 15 07:56 EDT 2019. Contains 328026 sequences. (Running on oeis4.)