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a(n) = 11^n mod 1000.
1

%I #12 Sep 08 2022 08:46:03

%S 1,11,121,331,641,51,561,171,881,691,601,611,721,931,241,651,161,771,

%T 481,291,201,211,321,531,841,251,761,371,81,891,801,811,921,131,441,

%U 851,361,971,681,491,401,411,521,731,41,451,961,571,281,91,1,11,121,331,641,51,561,171,881,691,601

%N a(n) = 11^n mod 1000.

%C Period = 50.

%H Vincenzo Librandi, <a href="/A216131/b216131.txt">Table of n, a(n) for n = 0..1000</a>

%t PowerMod[11, Range[0, 100], 1000] (* _Vincenzo Librandi_, Aug 16 2016 *)

%o (PARI) for(i=0, 100, print(11^i%1000" "))

%o (Magma) [Modexp(11, n, 1000): n in [0..110]]; // _Vincenzo Librandi_, Aug 16 2016

%Y Cf. A216100.

%K nonn,easy

%O 0,2

%A _V. Raman_, Sep 01 2012

%E a(0) = 1 prepended and offset changed by _Vincenzo Librandi_, Aug 16 2016