

A281313


Write n in Elias's delta code, interchange the 1's and 0's and convert it back to decimal.


2



0, 7, 6, 11, 10, 9, 8, 63, 62, 61, 60, 59, 58, 57, 56, 111, 110, 109, 108, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 97, 96, 191, 190, 189, 188, 187, 186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176, 175, 174, 173, 172, 171, 170, 169, 168, 167, 166, 165, 164, 163, 162
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OFFSET

1,2


LINKS

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


EXAMPLE

For n = 10, the Elias delta code for 10 is '11000010' and after interchanging the 0's and 1's it becomes '00111101'. Now, 111101_2 = 61_10. So, a(10) = 61.


PROG

(Python)
def a(n):
....s=""
....for i in A281150(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), A281150.
Sequence in context: A197588 A021569 A085964 * A082121 A309622 A215338
Adjacent sequences: A281310 A281311 A281312 * A281314 A281315 A281316


KEYWORD

nonn,base


AUTHOR

Indranil Ghosh, Jan 19 2017


STATUS

approved



