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a(n) = n-th prime modulo 26.
2

%I #17 Dec 12 2024 09:29:53

%S 2,3,5,7,11,13,17,19,23,3,5,11,15,17,21,1,7,9,15,19,21,1,5,11,19,23,

%T 25,3,5,9,23,1,7,9,19,21,1,7,11,17,23,25,9,11,15,17,3,15,19,21,25,5,7,

%U 17,23,3,9,11,17,21,23,7,21,25,1,5,19,25,9,11,15,21

%N a(n) = n-th prime modulo 26.

%H Vincenzo Librandi, <a href="/A242124/b242124.txt">Table of n, a(n) for n = 1..1000</a>

%F Sum_k={1..n} a(k) ~ 13*n. - _Amiram Eldar_, Dec 12 2024

%t Mod[Prime[Range[100]], 26]

%o (Magma) [p mod(26): p in PrimesUpTo(500)];

%o (Sage) [mod(p, 26) 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