A004217 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A004217

(n^n)^(n^n)

%I #11 Dec 25 2024 13:14:24

%S 1,256,443426488243037769948249630619149892803

%N (n^n)^(n^n)

%C The next four terms have 617, 10922, 217833 and 4871823 digits respectively. - _Rick L. Shepherd_, May 07 2006

%F a(n) = A000312(A000312(n)) = n^A007778(n) = A002488(n)^n = A002489(n)^A000169(n)

%t (#^#)^(#^#)&/@Range[4] (* _Harvey P. Dale_, Dec 25 2024 *)

%K nonn,easy,bref,changed

%O 1,2

%A _Henry Bottomley_, Jun 08 2000