A349932 Product of n and its binary ones' complement.

0, 2, 0, 12, 10, 6, 0, 56, 54, 50, 44, 36, 26, 14, 0, 240, 238, 234, 228, 220, 210, 198, 184, 168, 150, 130, 108, 84, 58, 30, 0, 992, 990, 986, 980, 972, 962, 950, 936, 920, 902, 882, 860, 836, 810, 782, 752, 720, 686, 650, 612, 572, 530, 486, 440, 392, 342, 290

Offset: 1

Author

Judson Neer, Dec 05 2021

Keywords

• nonn
• base
• easy

Examples

			For n = 9, a(9) = 0b1001 * 0b0110 = 9 * 6 = 54.
		

Crossrefs

Cf. A035327.

Programs

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

Formula

a(n) = n*A035327(n).