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 A099007 #7 Sep 08 2022 08:45:15
%S A099007 3,19,47,139,367,467,839,1319,1699,1907,3407,4003,4987,6079,7703,
%T A099007 10499,11527,13159,16747,17387,19379,23687,25219,26003,30103,32707,
%U A099007 33599,35419,38239,44203,50599,53959,55103,57427,62219,69767,72379,76387
%N A099007 Primes of the form 6n^2 - 2n - 1.
%C A099007 All terms are == 3 (mod 4).
%H A099007 Vincenzo Librandi, <a href="/A099007/b099007.txt">Table of n, a(n) for n = 1..1000</a>
%e A099007 For n = 2 we have 6*2^2 - 2*2 -1 = 19.
%t A099007 Select[Table[6n^2-2n-1,{n,0,2000}],PrimeQ] (* _Vincenzo Librandi_, Jul 17 2012 *)
%o A099007 (PARI) for(k=1,120,if(isprime(p=6*k^2-2*k-1),print1(p,",")))
%o A099007 (Magma) [a: n in [0..250] | IsPrime(a) where a is 6*n^2 - 2*n - 1]; // _Vincenzo Librandi_, Jul 17 2012
%Y A099007 Cf. A098828.
%K A099007 nonn,easy
%O A099007 1,1
%A A099007 _Giovanni Teofilatto_, Nov 07 2004
%E A099007 Edited, corrected and extended by _Klaus Brockhaus_, Nov 12 2004