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%I #18 Dec 18 2023 17:16:28
%S 0,1,16,15,14,9,20,3,4,5,12,11,12,5,4,3,20,9,14,15,16,1,0,1,16,15,14,
%T 9,20,3,4,5,12,11,12,5,4,3,20,9,14,15,16,1,0,1,16,15,14,9,20,3,4,5,12,
%U 11,12,5,4,3,20,9,14,15,16,1,0,1,16,15,14,9,20,3,4,5,12,11,12,5,4,3,20,9
%N a(n) = n^4 mod 22.
%C Equivalently: n^(10*m + 4) mod 22. - _G. C. Greubel_, Apr 05 2016
%H G. C. Greubel, <a href="/A070541/b070541.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_22">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
%F From _G. C. Greubel_, Apr 05 2016: (Start)
%F a(21*n) = 0.
%F a(n+21) = a(n). (End)
%t PowerMod[Range[0, 100], 4, 22] (* _G. C. Greubel_, Apr 05 2016 *)
%t PadRight[{},120,{0,1,16,15,14,9,20,3,4,5,12,11,12,5,4,3,20,9,14,15,16,1}] (* _Harvey P. Dale_, Feb 25 2017 *)
%o (Sage) [power_mod(n,4,22)for n in range(0, 84)] # _Zerinvary Lajos_, Oct 31 2009
%o (Magma) [Modexp(n, 4, 22): n in [0..100]]; // _Vincenzo Librandi_, Apr 06 2016
%o (PARI) a(n)=n^4%22 \\ _Charles R Greathouse IV_, Apr 06 2016
%K nonn,easy
%O 0,3
%A _N. J. A. Sloane_, May 13 2002
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