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a(n) = n-th prime modulo 27.
4

%I #16 Dec 12 2024 09:29:56

%S 2,3,5,7,11,13,17,19,23,2,4,10,14,16,20,26,5,7,13,17,19,25,2,8,16,20,

%T 22,26,1,5,19,23,2,4,14,16,22,1,5,11,17,19,2,4,8,10,22,7,11,13,17,23,

%U 25,8,14,20,26,1,7,11,13,23,10,14,16,20,7,13,23,25,2,8

%N a(n) = n-th prime modulo 27.

%H Vincenzo Librandi, <a href="/A242125/b242125.txt">Table of n, a(n) for n = 1..1000</a>

%F Sum_k={1..n} a(k) ~ (27/2)*n. - _Amiram Eldar_, Dec 12 2024

%t Mod[Prime[Range[100]], 27]

%o (Magma) [p mod(27): p in PrimesUpTo(500)];

%o (Sage) [mod(p, 27) for p in primes(500)] # _Bruno Berselli_, May 05 2014

%Y Cf. similar sequences listed in A242119.

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, May 05 2014