This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A066916 #17 Dec 09 2024 10:41:42
%S A066916 0,1,8,15,624,35,117648,4095,531440,9999,25937424600,20735,
%T A066916 23298085122480,7529535,2562890624,4294967295,48661191875666868480,
%U A066916 34012223,104127350297911241532840,25599999999,7355827511386640,26559922791423,907846434775996175406740561328,110075314175
%N A066916 a(n) = n^phi(n) - 1.
%H A066916 Harry J. Smith, <a href="/A066916/b066916.txt">Table of n, a(n) for n = 1..100</a>
%F A066916 a(n) = A062981(n) - 1.
%t A066916 Table[n^EulerPhi[n]-1,{n,30}] (* _Harvey P. Dale_, May 06 2015 *)
%o A066916 (PARI) a(n) = { n^eulerphi(n) - 1 } \\ _Harry J. Smith_, Apr 06 2010
%Y A066916 Cf. A000010, A062981, A066727, A066915.
%K A066916 nonn
%O A066916 1,3
%A A066916 _Jason Earls_, Jan 23 2002