A370824 a(n) are the denominators corresponding to A370823(n).

1, 5, 19, 13, 211, 95, 2059, 1261, 19171, 5275, 7613, 1159, 1586131, 4766585, 14316139, 505661, 129009091, 2910965, 1161737179, 12675403, 10458256051, 1364211535, 2002867877, 620687383, 847255055011, 2541798719465, 7625463267259, 157769131169, 68629840493971, 86254737475

Offset: 1

Author

Hugo Pfoertner, Mar 02 2024

Keywords

• nonn
• frac

Comments

See A370823 for more information.

Examples

			A370823(n)/a(n) for n = 1..11: 2/1, 16/5, 104/19, 128/13, 3872/211, 3328/95, 139904/2059, 167936/1261, 5038592/19171, 2748416/5275, 7886848/7613.
		

Links

• Paolo Xausa, Table of n, a(n) for n = 1..1000

Crossrefs

A370823 are the corresponding numerators.

Programs

Mathematica

Array[Denominator[(3^#-1)/((3/2)^#-1)/2] &, 35] (* Paolo Xausa, Mar 13 2024 *)

PARI

\\ See A370823 for functions a370823_4(n)
denominator(a370823_4(n))

Python

from math import gcd
def A370824(n): return (a:=3**n-(1<Chai Wah Wu, Mar 07 2024

Formula

Denominator of 2^(n-1)*(3^n-1)/(3^n-2^n). - Chai Wah Wu, Mar 07 2024