OFFSET
0,11
COMMENTS
The binary expansions of n and a(n) have no common 1's.
LINKS
FORMULA
EXAMPLE
The first terms, alongside the corresponding binary expansions, are:
n a(n) bin(n) bin(a(n)) bin(n OR a(n))
-- ---- ------ --------- --------------
0 0 0 0 0
1 0 1 0 1
2 1 10 1 11
3 0 11 0 11
4 1 100 1 101
5 0 101 0 101
6 1 110 1 111
7 0 111 0 111
8 1 1000 1 1001
9 0 1001 0 1001
10 5 1010 101 1111
11 4 1011 100 1111
12 3 1100 11 1111
13 2 1101 10 1111
14 1 1110 1 1111
15 0 1111 0 1111
MATHEMATICA
A370427[n_] := With[{r = IntegerReverse[n, 2]}, r - BitAnd[n, r]];
Array[A370427, 2^7, 0] (* Paolo Xausa, Feb 20 2024 *)
PROG
(PARI) a(n) = my (r = fromdigits(Vecrev(binary(n)), 2)); r - bitand(n, r)
CROSSREFS
KEYWORD
AUTHOR
Rémy Sigrist, Feb 18 2024
STATUS
approved