This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A142005 #20 Apr 29 2025 04:51:30 %S A142005 311,373,683,1117,1303,1427,1489,1613,1861,2357,2543,2729,2791,3163, %T A142005 3659,3907,4093,4217,4651,5023,5147,5209,5333,5519,5581,5953,6263, %U A142005 6449,6883,7069,7193,7937,8123,8681,8867,8929,9239,9859,10169,10789,11161,11471,11657 %N A142005 Primes congruent to 1 mod 31. %C A142005 Primes congruent to 1 mod 62. - _Chai Wah Wu_, Apr 28 2025 %H A142005 Vincenzo Librandi, <a href="/A142005/b142005.txt">Table of n, a(n) for n = 1..1000</a> %t A142005 Select[Range[1,20000,31],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 07 2011 *) %o A142005 (Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 1 ]; // _Vincenzo Librandi_, Aug 17 2012 %o A142005 (PARI) is(n)=isprime(n) && n%31==1 \\ _Charles R Greathouse IV_, Jul 01 2016 %Y A142005 Cf. A000040, A141977. %K A142005 nonn,easy %O A142005 1,1 %A A142005 _N. J. A. Sloane_, Jul 11 2008