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Primes congruent to 25 mod 28.
1

%I #9 Sep 08 2022 08:45:35

%S 53,109,137,193,277,389,557,613,641,809,977,1033,1061,1117,1201,1229,

%T 1453,1481,1621,1733,1789,1873,1901,2069,2153,2237,2293,2377,2657,

%U 2713,2741,2797,2909,3049,3217,3301,3329,3413,3469,3581,3637,3833,3889,3917,4001

%N Primes congruent to 25 mod 28.

%H Vincenzo Librandi, <a href="/A141975/b141975.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Prime[Range[1500]],MemberQ[{25},Mod[#,28]]&] (* _Vincenzo Librandi_, Aug 17 2012 *)

%o (Magma) [p: p in PrimesUpTo(5000) | p mod 28 eq 25 ]; // _Vincenzo Librandi_, Aug 17 2012

%o (PARI) is(n)=isprime(n) && n%28==25 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_, Jul 11 2008