A281313 Write n in Elias's delta code, interchange the 1's and 0's and convert it back to decimal.

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

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