A142006 - OEIS

%I #21 Oct 01 2024 03:08:29

%S 2,157,281,467,653,839,1087,1459,1583,1831,2017,2141,2203,2389,2699,

%T 3257,3319,3691,3877,4001,4373,4621,4931,4993,5179,5303,5737,5861,

%U 5923,6047,6481,6791,6977,7039,7349,7411,7907,8093,8527,8713,8837,9209,9643,9767

%N Primes congruent to 2 mod 31.

%H Vincenzo Librandi, <a href="/A142006/b142006.txt">Table of n, a(n) for n = 1..1000</a>

%F {2} UNION A142874. - _R. J. Mathar_, Jul 20 2008

%F a(n) ~ 30n log n. - _Charles R Greathouse IV_, Apr 28 2015

%t Select[Range[2,20000,31],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 07 2011 *)

%o (Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 2 ]; // _Vincenzo Librandi_, Aug 17 2012

%o (PARI) select(n->n%31==2, primes(1000)) \\ _Charles R Greathouse IV_, Apr 28 2015

%Y Cf. A000040, A141977, A142005.

%K nonn,easy,changed

%O 1,1

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