A066489 Binary expansion of n followed by its reverse complement.

10, 1010, 1100, 100110, 101010, 110100, 111000, 10001110, 10010110, 10101010, 10110010, 11001100, 11010100, 11101000, 11110000, 1000011110, 1000101110, 1001010110, 1001100110, 1010011010, 1010101010, 1011010010, 1011100010, 1100011100, 1100101100, 1101010100

Offset

1,1

Links

Table of n, a(n) for n=1..26.

Example

a(2) = 1010 because 2 in binary is 10, the complement of which is 01, the reverse of which is 10, hence (10)(10). - Sean A. Irvine, Oct 22 2023

Maple

a:= n-> (l-> parse(cat(seq(l[-i], i=1..nops(l)), 1-~l[])))(Bits[Split](n)):
seq(a(n), n=1..30);  # Alois P. Heinz, Oct 22 2023

Prog

(PARI) a(n)={my(v=binary(n)); fromdigits(concat(v, vector(#v, i, 1-v[#v+1-i])))} \\ Andrew Howroyd, Oct 22 2023

Crossrefs

Binary expansion of numbers in A035928.

Sequence in context: A104486 A098753 A276758 * A063171 A075166 A071671

Adjacent sequences: A066486 A066487 A066488 * A066490 A066491 A066492

Keyword

base,easy,nonn

Author

John McNamara, Jan 09 2002

Extensions

Title clarified and more terms from Sean A. Irvine, Oct 22 2023

Status

approved