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 A142031 #12 Sep 08 2022 08:45:35 %S A142031 89,151,337,461,523,647,709,1019,1453,1949,2011,2383,2693,2879,3251, %T A142031 3313,3499,3623,4057,4243,4801,4987,5297,5483,5669,6599,6661,6971, %U A142031 7219,7529,7591,7901,7963,8087,8273,8521,8707,8831,8893,9203,10009,10133,10567,10691 %N A142031 Primes congruent to 27 mod 31. %H A142031 Vincenzo Librandi, <a href="/A142031/b142031.txt">Table of n, a(n) for n = 1..1000</a> %F A142031 a(n) ~ 30n log n. - _Charles R Greathouse IV_, Jul 02 2016 %t A142031 Select[Range[27,20000,31],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 30 2011 *) %o A142031 (Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 27 ]; // _Vincenzo Librandi_, Aug 18 2012 %o A142031 (PARI) is(n)=isprime(n) && n%31==27 \\ _Charles R Greathouse IV_, Jul 02 2016 %Y A142031 Cf. A000040, A142005, A142006, A142029. %K A142031 nonn,easy %O A142031 1,1 %A A142031 _N. J. A. Sloane_, Jul 11 2008