

A280995


a(n) is the number produced when n is converted to binary reflected Gray code, the binary digits are reversed and the code is converted back to decimal.


1



0, 1, 3, 1, 3, 7, 5, 1, 3, 11, 15, 7, 5, 13, 9, 1, 3, 19, 27, 11, 15, 31, 23, 7, 5, 21, 29, 13, 9, 25, 17, 1, 3, 35, 51, 19, 27, 59, 43, 11, 15, 47, 63, 31, 23, 55, 39, 7, 5, 37, 53, 21, 29, 61, 45, 13, 9, 41, 57, 25, 17, 49, 33, 1, 3, 67, 99, 35, 51, 115, 83, 19, 27, 91, 123, 59, 43
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OFFSET

0,3


COMMENTS

a(n) = A003188(n) iff A014550(n) is palindromic.


LINKS

Indranil Ghosh, Table of n, a(n) for n = 0..50000


EXAMPLE

For n = 8, the binary reflected Gray code representation of n is '1100' which when reversed becomes '0011'; and 11_2 = 3_10. So, a(8) = 3.


PROG

(Python)
def a(n):
....return int(bin(n^(n/2))[2:][::1], 2)


CROSSREFS

Cf. A003188, A014550, A030101.
Sequence in context: A114972 A107461 A035619 * A092689 A281553 A064434
Adjacent sequences: A280992 A280993 A280994 * A280996 A280997 A280998


KEYWORD

nonn,base


AUTHOR

Indranil Ghosh, Jan 19 2017


STATUS

approved



