A305989 Numbers in binary reversed.

0, 1, 1, 11, 1, 101, 11, 111, 1, 1001, 101, 1101, 11, 1011, 111, 1111, 1, 10001, 1001, 11001, 101, 10101, 1101, 11101, 11, 10011, 1011, 11011, 111, 10111, 1111, 11111, 1, 100001, 10001, 110001, 1001, 101001, 11001, 111001, 101, 100101, 10101, 110101, 1101, 101101, 11101, 111101, 11, 100011, 10011

Offset

0,4

Links

David F. Marrs, Table of n, a(n) for n = 0..10000

Formula

a(n) = A004086(A007088(n)).

Example

11 is 1011 in binary, and reversing it gives 1101 = a(11).

Maple

a:= n-> parse(cat(convert(n, base, 2)[])):
seq(a(n), n=0..75);  # Alois P. Heinz, Jun 17 2018

Mathematica

Table[FromDigits@ Reverse@ IntegerDigits[n, 2], {n, 0, 50}]

Prog

(PARI) a(n) = fromdigits(Vecrev(digits(n, 2)), 10);
(Python) print(0)
for i in range(1, 50):
   print(format(i, 'b')[::-1].strip("0"))

Crossrefs

Cf. A305877, A004086, A007088, A030101.

Sequence in context: A245677 A182041 A086994 * A286821 A290210 A289889

Adjacent sequences: A305986 A305987 A305988 * A305990 A305991 A305992

Keyword

nonn,base,easy

Author

David F. Marrs, Jun 16 2018

Status

approved