|
|
A080414
|
|
Take the rightmost three binary digits of n (for n<4 padded with leading zeros) and rotate right 1 digit.
|
|
4
|
|
|
0, 4, 1, 5, 2, 6, 3, 7, 8, 12, 9, 13, 10, 14, 11, 15, 16, 20, 17, 21, 18, 22, 19, 23, 24, 28, 25, 29, 26, 30, 27, 31, 32, 36, 33, 37, 34, 38, 35, 39, 40, 44, 41, 45, 42, 46, 43, 47, 48, 52, 49, 53, 50, 54, 51, 55, 56, 60, 57, 61, 58, 62, 59, 63, 64, 68, 65, 69, 66, 70, 67, 71, 72
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
For n>7: a(n) = 8*floor(n/8) + a(n mod 8);
|
|
LINKS
|
|
|
EXAMPLE
|
a(2)=a('010')='001'=1; a(3)=a('011')='101'=5; a(4)=a('100')='010'=2; a(5)=a('101')='110'=6;
a(20)=a('10'100')='10'010'=18; a(21)=a('10'101')='10'110'=22.
|
|
MATHEMATICA
|
r3bd[n_]:=Module[{a, b}, {a, b}=Reverse[TakeDrop[IntegerDigits[n, 2], -3]]; FromDigits[Join[a, RotateRight[b]], 2]]; Join[{0, 4, 1, 5}, Table[r3bd[n], {n, 4, 80}]] (* Harvey P. Dale, Jul 30 2021 *)
|
|
PROG
|
(Python)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|