A143292 Gray code of prime(n) (decimal representation).

3, 2, 7, 4, 14, 11, 25, 26, 28, 19, 16, 55, 61, 62, 56, 47, 38, 35, 98, 100, 109, 104, 122, 117, 81, 87, 84, 94, 91, 73, 64, 194, 205, 206, 223, 220, 211, 242, 244, 251, 234, 239, 224, 161, 167, 164, 186, 176, 146, 151, 157, 152, 137, 134, 385, 388, 395, 392, 415

Offset

1,1

Links

Table of n, a(n) for n=1..59.

Eric Weisstein, Mathematica Notebook GrayCode.nb

Eric Weisstein, Gray code.

Formula

a(n) = A003188( A000040(n) ). - R. J. Mathar, Nov 11 2011

Maple

with(Bits):: seq(Xor(ithprime(n), (ithprime(n)-1)/2), n=2..50) # Gary Detlefs, Aug 03 2013

Prog

(PARI) a(n)=bitxor(n=prime(n), n>>1) \\ Charles R Greathouse IV, Apr 19 2012
(Python)
from sympy import prime
def A143292(n): return (p:=prime(n))^ p>>1 # Chai Wah Wu, Jun 29 2022

Crossrefs

Sequence in context: A059029 A360968 A056434 * A293447 A324867 A265386

Adjacent sequences: A143289 A143290 A143291 * A143293 A143294 A143295

Keyword

nonn,easy

Author

Roger L. Bagula and Gary W. Adamson, Oct 21 2008

Status

approved