A079286 a(n) = (3^n)! - (2^n)!.

0, 4, 362856, 10888869450418352160767959680

Offset: 0

Author

Cino Hilliard, Feb 08 2003

Keywords

• easy
• nonn

Comments

Sum_{n>0} 1/a(n) = 0.25000275591...

The next term is too large to include.

The next term (a(4)) has 121 digits. - Harvey P. Dale, Jan 10 2024

Links

• Amiram Eldar, Table of n, a(n) for n = 0..5

Crossrefs

Cf. A000722, A079288.

Programs

Mathematica

Table[(3^n)!-(2^n)!,{n,0,4}] (* Harvey P. Dale, Jan 10 2024 *)

PARI

atonfact(n) = {for(x=0, n, y = (3^x)!-(2^x)!; print1(y, ", "));}

Formula

a(n) = A079288(n) - A000722(n). - Michel Marcus, Jul 08 2024