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%I #9 Sep 08 2022 08:45:35
%S 31,109,421,499,577,733,811,967,1123,1201,1279,1669,1747,2137,2293,
%T 2371,2683,2917,3229,3307,3463,3541,3697,3853,3931,4243,4789,5023,
%U 5101,5179,5413,5569,5647,5881,6037,6271,6427,6661,7129,7207,7753,8221,8377,8689
%N Primes congruent to 31 mod 39.
%H Vincenzo Librandi, <a href="/A142177/b142177.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) ~ 24n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t Select[Prime[Range[3000]],MemberQ[{31},Mod[#,39]]&] (* _Vincenzo Librandi_, Aug 20 2012 *)
%o (Magma) [p: p in PrimesUpTo(10000) | p mod 39 eq 31 ]; // _Vincenzo Librandi_, Aug 20 2012
%o (PARI) is(n)=isprime(n) && n%39==31 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y Cf. A000040.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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