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%I
%S 311,373,683,1117,1303,1427,1489,1613,1861,2357,2543,2729,2791,3163,
%T 3659,3907,4093,4217,4651,5023,5147,5209,5333,5519,5581,5953,6263,
%U 6449,6883,7069,7193,7937,8123,8681,8867,8929,9239,9859,10169,10789,11161,11471,11657
%N Primes congruent to 1 mod 31.
%H Vincenzo Librandi, <a href="/A142005/b142005.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[1,20000,31],PrimeQ] (*From Vladimir Joseph Stephan Orlovsky, Apr 7 2011*)
%o (MAGMA) [p: p in PrimesUpTo(12000) | p mod 31 eq 1 ]; // _Vincenzo Librandi_, Aug 17 2012
%Y Cf. A000040, A141977.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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