A004217 a(n) = (n^n)^(n^n).

1, 1, 256, 443426488243037769948249630619149892803

Offset: 0

Author

Henry Bottomley, Jun 08 2000

Keywords

• nonn
• easy

Comments

The next four terms have 617, 10922, 217833 and 4871823 digits respectively. - Rick L. Shepherd, May 07 2006

Links

• Jinyuan Wang, Table of n, a(n) for n = 0..4

Programs

Mathematica

(#^#)^(#^#)&/@Range[4] (* Harvey P. Dale, Dec 25 2024 *)

Formula

a(n) = A000312(A000312(n)) = n^A007778(n) = A002488(n)^n = A002489(n)^A000169(n).

Extensions

a(0) prepended by Jinyuan Wang, Jan 17 2025