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 A201787 #6 Sep 08 2022 08:46:01
%S A201787 239,599,839,1439,3119,4799,9239,34439,41399,45119,59399,63839,123239,
%T A201787 139439,142799,186239,206039,235439,244199,248639,257639,285599,
%U A201787 290399,300119,320039,361799,465119,508799,588239,602039,608999,666119
%N A201787 Primes of the form 5n^2 - 6.
%H A201787 Vincenzo Librandi, <a href="/A201787/b201787.txt">Table of n, a(n) for n = 1..5000</a>
%t A201787 Select[Table[5n^2-6,{n,1,1000}],PrimeQ]
%o A201787 (Magma) [a: n in [1..400] | IsPrime(a) where a is 5*n^2-6];
%K A201787 nonn,easy
%O A201787 1,1
%A A201787 _Vincenzo Librandi_, Dec 05 2011