A300571 a(n) is the concatenation n in base 2, n-1 in base 2, ..., 0 in base 2.

0, 10, 1010, 111010, 100111010, 101100111010, 110101100111010, 111110101100111010, 1000111110101100111010, 10011000111110101100111010, 101010011000111110101100111010, 1011101010011000111110101100111010, 11001011101010011000111110101100111010

Offset

0,2

Links

Seiichi Manyama, Table of n, a(n) for n = 0..155

Formula

a(n) = A300570(n)*10. - Chai Wah Wu, Feb 26 2023

Prog

(Python)
from functools import reduce
def A300571(n): return int(bin(reduce(lambda i, j:(i<<j.bit_length())+j, range(n, 0, -1), 0))[2:])*10 # Chai Wah Wu, Feb 26 2023

Crossrefs

Cf. A007088, A058935, A300570.

Sequence in context: A080070 A303610 A080120 * A274069 A325493 A006937

Adjacent sequences: A300568 A300569 A300570 * A300572 A300573 A300574

Keyword

nonn,base

Author

Seiichi Manyama, Mar 08 2018

Status

approved