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%I #18 Sep 08 2022 08:45:33
%S 0,2,4,40,16,672,576,5760,57600,182784,779264,3598336,10817536,
%T 41066496,8011776,616988672,1874919424,1569325056,15693250560,
%U 19493552128,194935521280,1949355212800,10697459105792,36605846880256,225320980447232,1409990787072
%N a(n) = 10^n mod 4^n.
%H Vincenzo Librandi, <a href="/A139735/b139735.txt">Table of n, a(n) for n = 0..300</a>
%t Table[PowerMod[10, n, 4^n], {n, 0, 30}] (* _Vincenzo Librandi_, Jun 12 2016 *)
%o (Magma) [Modexp(10, n, 4^n): n in [0..30]]; // _Vincenzo Librandi_, Jun 11 2016
%o (PARI) a(n)=10^n%4^n \\ _Charles R Greathouse IV_, Jun 04 2011
%o (PARI) a(n)=if(n,lift(Mod(5,2^n)^n)<<n,0) \\ _Charles R Greathouse IV_, Jun 04 2011
%K nonn
%O 0,2
%A _N. J. A. Sloane_, May 20 2008
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