OFFSET
1,2
FORMULA
a(n) = n*A035327(n).
EXAMPLE
For n = 9, a(9) = 0b1001 * 0b0110 = 9 * 6 = 54.
PROG
(PARI) a(n) = n*bitneg(n, exponent(n)) \\ Andrew Howroyd, Dec 05 2021
(Python)
def a(n): return 0 if n == 0 else n * (n^((1 << n.bit_length()) - 1))
print([a(n) for n in range(1, 58)]) # Michael S. Branicky, Dec 05 2021
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Judson Neer, Dec 05 2021
STATUS
approved