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 A066609 #13 Dec 07 2024 14:55:36
%S A066609 0,25,125,625,0,73,10897,30177,4508,65625,29672,36433,263034,288873,
%T A066609 575000,159681,592030,1485433,1639363,1240625,250928,928073,4040001,
%U A066609 93601,0,10915033,14288075,16048657,3176520,4515625
%N A066609 a(n) = 5^n mod n^5.
%H A066609 Harry J. Smith, <a href="/A066609/b066609.txt">Table of n, a(n) for n = 1..1000</a>
%e A066609 a(6) = 73 as 5^6 = 15625 = (6^5)*2 + 73.
%t A066609 Table[PowerMod[5,n,n^5],{n,30}] (* _Harvey P. Dale_, Jul 05 2023 *)
%o A066609 (PARI) a(n) = { lift(Mod(5, n^5)^n) } \\ _Harry J. Smith_, Mar 11 2010
%Y A066609 Cf. A066606.
%K A066609 nonn
%O A066609 1,2
%A A066609 _Amarnath Murthy_, Dec 24 2001
%E A066609 More terms from _Robert G. Wilson v_, Dec 26 2001