A147994 Gray code base 4 applied to Hofstadter's(A005185 Hofstadter Q - sequence): a(n)=GrayCode[Hofstadter[n] - 1, 4].

0, 0, 1, 3, 3, 2, 6, 6, 7, 7, 7, 4, 4, 4, 13, 12, 13, 15, 15, 14, 14, 14, 14, 8, 11, 11, 8, 8, 8, 8, 2, 0, 0, 2, 6, 3, 2, 7, 6, 7, 5, 5, 4, 4, 4, 4, 4, 8, 4, 12, 11, 14, 13, 11, 11, 14, 8, 11, 8, 8, 8, 8, 4, 0, 9, 7, 3, 0, 5, 4, 6, 7, 4, 5, 4, 5, 13, 4, 12, 15, 14, 15, 15, 11, 14, 10, 9, 9, 11, 8, 8

Offset

1,4

References

https://mathworld.wolfram.com/notebooks/Combinatorics/GrayCode.nb.

Links

Table of n, a(n) for n=1..91.

Formula

a(n)=GrayCode[Hofstadter[n] - 1, 4].

Mathematica

<< DiscreteMath`CombinatorialFunctions` (* rather than put in the whole code :needs GrayCode.nb *) Table[GrayCode[Hofstadter[n] - 1, 4], {n, 100}]

Crossrefs

Sequence in context: A264756 A267942 A374481 * A106365 A200174 A266153

Adjacent sequences: A147991 A147992 A147993 * A147995 A147996 A147997

Keyword

nonn,changed

Author

Roger L. Bagula and Gary W. Adamson, Nov 18 2008

Status

approved