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

Author

John McNamara, Jan 09 2002

Keywords

• base
• easy
• nonn

Examples

			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
		

Crossrefs

Binary expansion of numbers in A035928.

Programs

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

PARI

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

Extensions

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