A356397 a(n) is the product of the terms in the n-th row of triangle A343835; a(0) = 1.

1, 1, 2, 3, 4, 4, 6, 7, 8, 8, 16, 24, 12, 12, 14, 15, 16, 16, 32, 48, 64, 64, 96, 112, 24, 24, 48, 72, 28, 28, 30, 31, 32, 32, 64, 96, 128, 128, 192, 224, 256, 256, 512, 768, 384, 384, 448, 480, 48, 48, 96, 144, 192, 192, 288, 336, 56, 56, 112, 168, 60, 60, 62

Offset: 0

Author

Rémy Sigrist, Aug 05 2022

Keywords

• nonn
• base

Examples

			For n = 11:
- row 11 of A343835 is (8, 3),
- so a(11) = 8 * 3 = 24.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 0..8192
• Index entries for sequences related to binary expansion of n

Crossrefs

Cf. A023758, A059867, A246674, A277561, A343835.

Programs

PARI

a(n) = { my (v=1); while (n, my (z=valuation(n, 2), o=valuation(n/2^z+1, 2), r=(2^o-1)*2^z); n-=r; v*=r); v }

Formula

a(2*n) = a(n) * A277561(n).

a(n) = n iff n belongs to A023758 \ {0}.

A246674(n) divides a(n).